Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a9136bc7ce8ca9…

MALICIOUS

PDF

71.1 KB Created: 2021-03-31 20:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ecf88964b9105c5bdc3ef308583b84bb SHA-1: c55a2277f3f16a2b092556b8d60f9fc61104b4d6 SHA-256: b7a9136bc7ce8ca9775b400c64df1c0e2d1c0d0769142884c4f4cd1b46d18210
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution lure. The document body, though heavily obfuscated, contains references to a 'Bernina 1130 manual', suggesting a pretext for directing users to malicious URLs. The embedded URLs, particularly 'https://yafferge.ru/wix?keyword=bernina+1130+manual', are critical IOCs pointing to known malicious redirector infrastructure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=bernina+1130+manual In PDF document text
    • http://auto-agents.space/baazigar_odia_video5fixg.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/cEECGji/wosuwilogolanivinaworuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_605371d7b6dd0.pdfIn PDF document text
    • https://munuliwakubife.weebly.com/uploads/1/3/1/6/131637312/1ad411ca293ed1.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/buwoxerigako_morurenusokif_tuzus.pdfIn PDF document text
    • https://cdn.sqhk.co/zirigajer/jvVwRhg/rusixevumitumowogipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_600c660fec77c.pdfIn PDF document text
    • http://velesvoyage.ru/medio_isotonico_hipotonico_e_hipertonicoae7ol.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/eLxYJAH/lileruvularupiluwuzoxude.pdfIn PDF document text
    • https://tasepatoravolun.weebly.com/uploads/1/3/4/3/134352318/vawonulewokidafaboxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_5fda767674388.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/lejesorugudatifalaopytu.pdfIn PDF document text
    • https://cdn.sqhk.co/sufajezugi/jLSwhiC/kajevelenama.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/hebif1L/dead_eyes_lyrics_adia_victoria.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/zomilobixa-xazabumuwidime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_3ec755b670864a0fb15f72ef2642b99b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/keeping_you_a_secret_sequel.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/journalistic_report_on_preserving_our_culture.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/bugijoxamikile.pdfIn PDF document text
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_b37437332cd14edcba0b701dd502e599.pdf?index=trueIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_3d6831523f7d44da8a472b967569e32e.pdf?index=trueIn 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_off0000d91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 5060 bytes
SHA-256: 7bf7a4a5b9b08df59c7b91f21e90ad799f0a336215da6623b214de862b678de6
font_01_sfnt_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 10984 bytes
SHA-256: 8200062d71b346a4c2a8cecaf58ebcc40be108f629cc3a42c179b1ddac056516