Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1f016594b543d7…

MALICIOUS

PDF

74.2 KB Created: 2021-02-17 06:25:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2341515f496ac250e5b52430a94128bb SHA-1: 06979da07cfb8d0307e76052b05976fa855000a7 SHA-256: 9b1f016594b543d7e5f0d8b2baa086d6357cab1b209a8d2d1ac3f5891f7ffe9d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, likely for SEO manipulation or to distribute further malicious content. The presence of a large number of external links on disposable hosting, coupled with the 'Urgency/Deadline' heuristic, suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://druttle.ru/wix?keyword=stanley+fatmax+450+charger+manual PDF link annotation
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/refabagosirulebom.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/fA1eGij/75501735288.pdfIn PDF document text
    • https://buzegiregusa.weebly.com/uploads/1/3/6/0/136082094/wetowevarepi-ziferetufis.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/zixinefateluj.pdfIn PDF document text
    • https://nelizebowi.weebly.com/uploads/1/3/4/7/134734992/9879299.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/7e9c9d36923.pdfIn PDF document text
    • https://tekaxudifen.weebly.com/uploads/1/3/5/9/135992886/bajin.pdfIn PDF document text
    • https://cdn.sqhk.co/nivabetaz/jcHgjic/66528658037.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/f6Agi4k/red_rose_wallpaper_for_desktop_full_size.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/Hq6ieFx/dilelofe.pdfIn PDF document text
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/wixiparugulojakoza.pdfIn PDF document text
    • https://cdn.sqhk.co/gitogozune/fgeqYNn/the_white_door_day_4_achievement.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/BhdIEQq/tap_tap_fish_abyssrium_pole.pdfIn PDF document text
    • https://tilavulam.weebly.com/uploads/1/3/0/7/130739056/wutepifep_wuruma.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/kujapomib/bizin.pdfIn PDF document text
    • http://ruxuvejefo.epizy.com/kannada_birthday_songs_kannada_masthi.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/pimaripuropobagetoluw.pdfIn PDF document text
    • http://zugejono.epizy.com/tewosemufageka.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/87138016998.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_off0000e423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 5744 bytes
SHA-256: 07651044207bedda5d9c5bebdcb1b7ede35a966b4dee7143e353f3d9cb2800bd
font_01_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 10524 bytes
SHA-256: 7a9e27e05bc9c2283b7b51eb31378f12a7b6df0a6174bf01fdcb7175bdaca476

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