Malicious PDF — malware analysis report

Static analysis result for SHA-256 7adabe4b0a7195e1…

MALICIOUS

PDF

76.4 KB Created: 2021-03-15 22:24:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9f29943e917c3fbe10ee4f8a9aeb72f7 SHA-1: de16a64622b873dcb64c922f76ffb982f354471b SHA-256: 7adabe4b0a7195e18f1f8519d7857e533154b218279ec10819355a18b7d66267
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a redirector at 'https://crophysi.ru/strik?utm_term=what+would+cause+a+washer+to+not+spin', which is flagged as malicious. The document also contains a link farm, suggesting a phishing or SEO scam. ClamAV detection and ML classification confirm its malicious nature, classifying it as Pdf.Phishing.Trojan.

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
  • 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/strik?utm_term=what+would+cause+a+washer+to+not+spin In PDF document text
    • https://kazenatujexisof.weebly.com/uploads/1/3/1/6/131637291/reseremezix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_5fd69c98a1446.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/LQheyji/teenage_mutant_ninja_turtles_legends_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_6038ee48ae2c3.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/4389035.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/isih4tQ/51097377360.pdfIn PDF document text
    • https://cdn.sqhk.co/zuretagugaf/ejjuhas/power_media_player_14_upgrade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_601dcd085f462.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/vWD0qif/handwriting_practice_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/fotinegataso/jgegcjg/ab_repeat_player_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/lepemafe/fAji3gi/cambridge_advanced_learners_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/dosazuleg/gcikhd9/86904181363.pdfIn PDF document text
    • https://pamezupiv.weebly.com/uploads/1/3/0/7/130775156/larakataluj_futepatuluf_famopokarunized_kotukenut.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/2haAQid/24147686828.pdfIn PDF document text
    • https://cdn.sqhk.co/felibepudu/iej2ifS/mein_schiff_metal_cruise_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ce7ac5-ec67-4023-8f8f-fb002206cd19/how_to_say_french_words_phonetically.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef4f4ee-07b7-4511-b1f9-afb53b7ac7b1/history_of_islamic_art_painting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d8ca909-7070-4170-b267-c6187d5ef5fe/hp_officejet_4500_printer_wireless_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de3ce57f-ee78-49ce-9be3-5ed0583a199c/gojomajalozule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3720096-2b1b-4fd0-b952-efab7e21c9f0/pepigizipexuzasejit.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_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 5264 bytes
SHA-256: 00fe1a9ececea422f5f0954f346d8078450c2cb7e9baf1148b56f1bc5bb0dd1d
font_01_sfnt_off0000fb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 11584 bytes
SHA-256: 23f2b693d7a1b0025f73cd7e71b5a221af91e0ad4a4be5e2e316b93acd13a95f