Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb5f50366d32ddc…

MALICIOUS

PDF

78.1 KB Created: 2021-01-22 13:40:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 162c01ac7ea1ee0a70cc8f17809b10bc SHA-1: 762d4685f522521e58e8712735cc263fc58f3dd4 SHA-256: ffb5f50366d32ddcd8fea242ee85aa908d899486abfae5ae506b832ebd9d8841
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports its malicious nature.

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
  • 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.
  • 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://trafffi.ru/123?utm_term=685+credit+score PDF link annotation
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/ef9ff960727bf.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/ehcjagd/extreme_car_driving_simulator_2_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/pojukitogex/jir0pOA/rally_racer_dirt_apk_indir.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/jhiiicH/20386355245.pdfIn PDF document text
    • https://cdn.sqhk.co/woravejafeto/jgWVRKA/gitatemug.pdfIn PDF document text
    • https://lirupije.weebly.com/uploads/1/3/1/6/131606624/34c4b01261c.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/jubipazalipila-lufujarumi-zolusod.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/jfFdQOk/jizojiw.pdfIn PDF document text
    • https://fefojaza.weebly.com/uploads/1/3/4/4/134480993/dedixan.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/hb4Hjda/3d_maze_man_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/jh679gh/mario_kart_stars_top_left_corner.pdfIn PDF document text
    • https://kajovagej.weebly.com/uploads/1/3/4/7/134747054/xesesadakeguto_xadilirovulom_ruparako_reromebibuned.pdfIn PDF document text
    • https://demutarovawo.weebly.com/uploads/1/3/3/9/133997894/voliraveguti.pdfIn PDF document text
    • https://kevanosum.weebly.com/uploads/1/3/0/9/130968994/pazolevebodo.pdfIn PDF document text
    • https://cdn.sqhk.co/pidagasew/h2jdihb/30th_birthday_party_decoration_ideas_for_her.pdfIn PDF document text
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/bapatevabagalol-vudisofugepefod-digose.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/kakekojezutok/marriage_anniversary_images_in_marathi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 4748 bytes
SHA-256: a6ff8f50f74dea1b68310cd7fd46962e6573508ac1e13daec8d5681f8f5d9b2d
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 11028 bytes
SHA-256: 74a8a76fc6793c7f9290a6be6a72de29db541808c99c9f9a40b556eb2d19b9f4
font_02_sfnt_off00011d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D70 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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