Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e3c5a2ac1147e4…

MALICIOUS

PDF

91.9 KB Created: 2021-03-25 17:05:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1e13ba6bf129ce9f8f009309763fd84d SHA-1: d4a1c381a0c18e390cf1911136f597b6d5a45ddb SHA-256: c0e3c5a2ac1147e406c2b02e8011452ac421f537d5828c3e03a586db1924c277
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting critical heuristic firings for malicious redirector links and a link farm. The embedded content, though partially obfuscated, suggests a lure related to 'imessage for android apk 2019', directing users to the malicious URL https://crophysi.ru/wix?keyword=imessage+for+android+apk+2019. This indicates a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/wix?keyword=imessage+for+android+apk+2019 In PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/178234.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/vepaxemizami.pdfIn PDF document text
    • https://wanibezitajijo.weebly.com/uploads/1/3/6/0/136000154/bomope.pdfIn PDF document text
    • https://seguvixezamab.weebly.com/uploads/1/3/5/9/135961197/f0ac99053c1977.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/how_long_did_ancient_greek_democracy_last.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/cheat_game_minecraft_android_bahasa_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/viper_alarm_remote_battery_died.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fedeae72-466a-4986-ba4e-6feef3e961de/cyberpower_cp1500avrlcd_intelligent_lcd_ups_system_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/bitcoin_trading_platform_us.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/96719156330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaab78a5-2245-4bcf-b12b-361b9fea115e/68803987698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/befc5713-b464-4d5a-a39b-812a64fc7afd/34129652755.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/moboraremali.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/bootstrap_3_landing_page_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab0528f-d641-451b-b408-5c341139249b/dexufuketikize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bafb8bc-494e-4921-9058-ffdae949ba9a/40950906312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb262a9e-2767-40ef-a0ac-ba117287b165/how_do_you_say_it_will_be_ok_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad7e4d3-af0a-4b88-b43c-b09511bd4c5d/by_default_excel_aligns_values.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/91977392646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0becdc-3712-42ff-8cc8-0b550a6fd44d/kenneth_hagin_books_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/clover_kanzashi_flower_maker_craft_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c156b4d7-8e1c-4a22-b83e-c8b554c6aa54/53992039113.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 5520 bytes
SHA-256: c5ba1b03bf0739a1adb0f81d4841f9c494768721c3618cbab8c7a93995438b34
font_01_sfnt_off0001196f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196F 11064 bytes
SHA-256: d82ea8e2f107ec6f017eb7497adae605156509a853f7cb3e23394e1ca50a6880
font_02_sfnt_off00013f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F58 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90
font_03_sfnt_off000153ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153EF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333