Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1883b4d292e8f1…

MALICIOUS

PDF

81.7 KB Created: 2021-03-16 06:22:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b6d4f587199a20ff21cb489840652b00 SHA-1: 82d854b0d91b9783d90f486d31a820aa914eeaf6 SHA-256: 2a1883b4d292e8f129e0efee4ae3c1f197b1e9e9a105d10f972d0ebc9c43a05a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the linked PDFs. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/strik?utm_term=how+to+remove+pimple+marks+on+face+home+remedies PDF link annotation
    • https://fugagabek.weebly.com/uploads/1/3/1/4/131453631/30269020cd8a6.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawitaxug/idC1hjd/my_business_instagram_account_was_disabled.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/hg38ygi/mifefusinavitutig.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/zgdVidb/vekexaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445892/normal_5fd2f8463133f.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/v5jirge/nizomumudoxovijipefa.pdfIn PDF document text
    • https://lovelutunaguj.weebly.com/uploads/1/3/4/7/134735325/rejomolut.pdfIn PDF document text
    • https://jafadunew.weebly.com/uploads/1/3/4/6/134632108/4592669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_602fd3c821cdf.pdfIn PDF document text
    • https://gebapawuvafiv.weebly.com/uploads/1/3/4/5/134519736/kejuf_mojixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492272/normal_60171ede56545.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/3557342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_6010f0156a665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385437/normal_5fe4c5c532b13.pdfIn PDF document text
    • https://poxemitiwafu.weebly.com/uploads/1/3/1/8/131871555/f27599aaa63.pdfIn PDF document text
    • https://cdn.sqhk.co/temokika/Pvjgoxa/men_s_haircut_drawing.pdfIn PDF document text
    • https://cdn.sqhk.co/tixelila/pggL3rN/8123872462.pdfIn PDF document text
    • https://cdn.sqhk.co/tigufarejeti/BxjgnGW/form_5_account_bab_1.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/962edc0c82c.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/jhTgjWI/dekuwe.pdfIn PDF document text
    • https://wojuguzibuliru.weebly.com/uploads/1/3/4/8/134896427/5122710.pdfIn PDF document text
    • https://xaliwituxezaxe.weebly.com/uploads/1/3/5/3/135323019/diviwanadema-noseletijeva-xopebe.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/Gig3hid/70770445242.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/86bca481-d3ab-4ba5-b2f9-cf8ea3c17cd6/tiwagixufusanobuxafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/218f5abd-7e65-4c36-b99f-fdc6f9f40bb2/69803828613.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_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 5572 bytes
SHA-256: 53b66e08b95dd0c03cda306453095a1cfccd56c3413df39ac5fcd31467f1b948
font_01_sfnt_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 10980 bytes
SHA-256: e166798cfc7d6c442a269079510f3f98911670f2f5a7391afcedc22e0b3d8a57