Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e9aaceee63e43b…

MALICIOUS

PDF

67.1 KB Created: 2021-02-15 20:37:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dfe8e97da24e99cb9e8c8572253a2ec4 SHA-1: b0db7cf190938afd6264e9d440f3ea011316a659 SHA-256: b6e9aaceee63e43b4eb7b5b656a1977c741de7b3041517a3fdbf029f7a246f88
254 Risk Score

Malware Insights

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

The PDF contains a link disguised as a worksheet title, which redirects to a malicious URL. This URL is part of a link farm designed to host numerous PDFs, likely for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/wix?keyword=check+your+checkbook+skills+worksheet In PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/wejufowojod.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/uhjgdij/monsters_war_epic_td_strategy_offline_games.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/bjc0k42/change_color_of_tab_text_android.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/jPXjhji/starlink_launch_today_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/gCkPxgf/25034525006.pdfIn PDF document text
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/5652002.pdfIn PDF document text
    • https://namosozevo.weebly.com/uploads/1/3/0/9/130969937/gozosonan_mowarudofoweto_kezibu.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/aUqu6hj/ben_10_heroes_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/xjb6jbs/emoney_advisor_customer_service.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/hfgjaLL/82590633950.pdfIn PDF document text
    • https://cdn.sqhk.co/gefisodir/ijjjVgJ/formula_fast_races_free.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/nasitevu/kijogunuk.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/65922481739.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/60832075369.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/ugandan_local_gospel_music.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_off0000cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 4980 bytes
SHA-256: 0227ef1dc3e3de8b2da6ff8ba83e3c7d741d3f5f3021e74e656ff761eae59448
font_01_sfnt_off0000dd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 9964 bytes
SHA-256: eaf2398149bf2ebce9e04a2c7e65e427cd194e8f142517cd4fb7d41a30e75ae0

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