Malicious PDF — malware analysis report

Static analysis result for SHA-256 345ab5158e913ad8…

MALICIOUS

PDF

78.2 KB Created: 2021-04-08 02:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1d8fadf8c9ff5d8bcfa45beab9a30331 SHA-1: e8e28d77bff8a860c79186944df7d489822268eb SHA-256: 345ab5158e913ad8f8acff4ca7d5a5947bd2f978679a31ad48768d0927c79d73
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, identified as a link farm, with one prominent URL being 'https://resalured.ru/123?utm_term=bosch+washer+dryer+manual'. This suggests a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=bosch+washer+dryer+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374373/normal_5fd764b00637f.pdfIn PDF document text
    • https://zorovapi.weebly.com/uploads/1/3/2/3/132303286/retivi.pdfIn PDF document text
    • https://linepapimufuto.weebly.com/uploads/1/3/1/6/131637640/wuwuxodemekefak_xuronubowun_vegopuneluxanu.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • https://cdn.sqhk.co/woxewoxe/ieidVji/bulbophyllum_moniliforme_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/hihabhc/70401936152.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/5066999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369329/normal_602d9204b96c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461245/normal_604f94ea94b5b.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/7JhbDpZ/download_air_fighters_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/gciihgY/luzelak.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/gc7HXjb/bucketlist_bombshells_bad_reviews.pdfIn PDF document text
    • http://pogekoxuw.mygamesonline.org/autogenous_shrinkage_of_concrete_tazawa.pdfIn PDF document text
    • https://cdn.sqhk.co/leribunopa/crhdja8/207144014.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/jajbajh/fovimojowojadifobi.pdfIn PDF document text
    • https://cdn.sqhk.co/nesuxozajek/sihifDx/tirokosazawijividamerose.pdfIn PDF document text
    • http://vatetuda.scienceontheweb.net/3651649383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_606e0de1a7515.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/state_of_michigan_answer_to_complaint.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/32262228333.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/bevatalevi.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_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 5424 bytes
SHA-256: 19ae135e6da56ec42fc181123ddacec5781b96fb732113ea0145f446920c4eee
font_01_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 10496 bytes
SHA-256: 51113b43bb8652de663804ee49aac8d9f017849601a7fac70da6fe81437848a4

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