Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87f2009b8fcff32…

MALICIOUS

PDF

75.2 KB Created: 2021-06-11 12:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: accb00577d61f01edddc515eae410dda SHA-1: 55ae29d7496065c5bfe35ae6734dc9a54728ac60 SHA-256: a87f2009b8fcff326bbc7e6edd6df73cc81a96ecb440c2d0caef27078fa5b884
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://synerhu.ru/pbw?utm_term=the+death+of+ivan+ilyich+full+text PDF link annotation
    • https://kivoranove.weebly.com/uploads/1/3/4/6/134679810/09c09b.pdfIn PDF document text
    • https://lumezoti.weebly.com/uploads/1/3/4/8/134863392/385306.pdfIn PDF document text
    • https://fudisilutopunus.weebly.com/uploads/1/3/1/4/131438012/joderikisobud.pdfIn PDF document text
    • https://ferodamogeko.weebly.com/uploads/1/3/5/3/135330017/957f9e1583fe.pdfIn PDF document text
    • https://xefakebeka.weebly.com/uploads/1/3/5/9/135993821/6706485.pdfIn PDF document text
    • https://danevetiwa.weebly.com/uploads/1/3/4/6/134600357/812938.pdfIn PDF document text
    • https://tazateniko.weebly.com/uploads/1/3/4/8/134885152/c6aea805284e.pdfIn PDF document text
    • https://gigiwejube.weebly.com/uploads/1/3/5/9/135984489/zovopenofofikoto.pdfIn PDF document text
    • https://kijujiwovijuk.weebly.com/uploads/1/3/1/4/131453096/mizuwagasosire_vexuda_fepux.pdfIn PDF document text
    • https://gajaxaja.weebly.com/uploads/1/3/2/7/132712369/xutirunidokudow-nilibotejavefu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144708222/nasp_basic_archery_instructor_manual.pdfIn PDF document text
    • http://xivoxibuza.pbworks.com/f/78362616281.pdfIn PDF document text
    • http://kivotin.pbworks.com/w/file/fetch/144677262/59321926928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e007d2cf-0234-4d64-8aeb-7a5ccc82688d/penetuko.pdfIn PDF document text
    • http://serizedez.pbworks.com/w/file/fetch/144739839/how_to_clean_the_homedics_cool_mist_humidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de13dd6-be0a-4089-b731-e2d3e798b54e/82421812774.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/f/act_3_scene_3_summary_othello.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_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 5012 bytes
SHA-256: 1bebd08526b2c83cc791ddb928b723b81f4523259f71fe393c19e3853d3f14e8
font_01_sfnt_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 11308 bytes
SHA-256: 4c4d91b94496fd87b30793aa3b3d327eba7242ee7083c7ee384388c24191b3d8

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