Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf1944b0d9d6fd7…

MALICIOUS

PDF

71.8 KB Created: 2021-02-24 17:36:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6f0cc956124ebb84e3ced9b8bc21329c SHA-1: 1565e8a97ecf9574ddb7865e5621fbc132341683 SHA-256: fcf1944b0d9d6fd72a5fede54e85a4e6cbefa8cd9dbb2d84a49f933821b9c0cd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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://maypoin.ru/strik?utm_term=how+to+turn+on+a+fake+fireplace PDF link annotation
    • https://fitabidik.weebly.com/uploads/1/3/0/7/130776693/8519059.pdfIn PDF document text
    • https://wonelapafilujol.weebly.com/uploads/1/3/1/6/131606162/biguxarogajobesoxe.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/fosakuwikivoxinoruk.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/sudutud.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/logitech_-_gamepad_f710_wireless_gaming_pc.pdfIn PDF document text
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/kudibijoxafeju-wurefakeperepe-kufokagebenula.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/65390647798.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/the_singer_2017_ep_10_eng_sub.pdfIn PDF document text
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/datowajuvudiduz_lemafoseliloze_gopagozubix.pdfIn PDF document text
    • https://rusunesezov.weebly.com/uploads/1/3/4/3/134309606/1ef3776af67b5b.pdfIn PDF document text
    • https://migawireradafus.weebly.com/uploads/1/3/2/6/132695569/8768391.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widifusi.myartsonline.com/kisujawa.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/application_deadline_for_texas_am_san_antonio.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/76008773831.pdfIn PDF document text
    • http://fukasutatota.rf.gd/bfbs_tv_guide_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/best_adventure_games_android_reddit.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_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 4948 bytes
SHA-256: 15877ec2622811bde77386861e83e22f9222855f3fd214c164099c6466befec2
font_01_sfnt_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 10848 bytes
SHA-256: 4116d0b6a593a9c34d0eff5eb7bb06a06465d1f0f1b886234e0d8ef57aa159a8

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