Malicious PDF — malware analysis report

Static analysis result for SHA-256 08038ca46bd98668…

MALICIOUS

PDF

79.4 KB Created: 2021-03-07 11:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4facc7d3717fc40a78b686354203e16e SHA-1: b62b52d4135a3b3ae46223a93cc4f179b440fb60 SHA-256: 08038ca46bd98668623f8b5779eb8e65c3717385116cd45430790512918444f5
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized content, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, and 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically flags an image lure linking to an SEO redirector. The primary malicious URL identified is https://lozipotod.ru/strik?utm_term=what+happened+in+the+fall+of+rome, which is likely used to redirect users to a malicious site. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://lozipotod.ru/strik?utm_term=what+happened+in+the+fall+of+rome PDF link annotation
    • https://cdn.sqhk.co/dofubetu/BzgdIDK/chess_board_setup_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/b7aicWE/zonujugexebeborakuze.pdfIn PDF document text
    • https://cdn.sqhk.co/wanolugago/aJhh2he/where_to_buy_basketball_trading_cards_near_me.pdfIn PDF document text
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/lepogudoj-tideragam.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/kovigilexinavu_jopirenujisod_jukelilenam_gopevajusubul.pdfIn PDF document text
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/7a02816eab.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/qGgqifp/gupapapazeluleluni.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/iqEgihg/41360108699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/impact_of_industrialization_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/100_egyptian_cotton_sheets_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/sqlite_insert_vs_update_performance.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_7cfc11a59f7346e9bc6fb0852ba605e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ad56ff-1b30-44e8-864b-56547f50c313/10341705007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a01bbe02-a03c-4a06-b954-0692b85ed166/24446622872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a1184b-a29d-40e6-9f23-ccdd97bc9fd1/does_a_usb_socket_need_extra_wiring.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_1f885ca35a314bde8f004b9e23fd7d96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/mafipen.pdfIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_c658eb465c2d46b388cc772cd487a6c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f8bb46a-1630-47af-bec4-d7e5b5995b3a/esa_essential_facts_about_the_computer_and_video_game_industry.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/dota_2_auto_chess_mobile_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/vemupuwuboditimiku.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/what_is_average_income_or_per_capita_income_class_10.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 5116 bytes
SHA-256: 16ca92f52f36203383b7d1835d00fb89167d5fb5a4d7c53ac49604dab1add1ed
font_01_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 11040 bytes
SHA-256: 0b6e4f81e79159da6ce96c637bf2c1097e6b284e98291661608ceef3b90a8efa