Malicious PDF — malware analysis report

Static analysis result for SHA-256 e573c4e46e5076a6…

MALICIOUS

PDF

86.3 KB Created: 2021-04-06 05:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 931e40303fd0d83a0b2afe1af41f0a91 SHA-1: 6665384920c259b94fe64726855954ea7a87c82e SHA-256: e573c4e46e5076a64bb29fea79b260b2b80ab37e2de7772f36a931005371a428
186 Risk Score

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 domains, 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. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful content.

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://xezojetit.ru/strik?utm_term=what+is+the+biblical+meaning+of+a+husband PDF link annotation
    • https://cdn.sqhk.co/gizoxemovefi/erkibKF/smash_champ_mod_apk_free_download.pdfIn PDF document text
    • https://bogigusojuvifu.weebly.com/uploads/1/3/4/3/134316749/3192900.pdfIn PDF document text
    • https://cdn.sqhk.co/gumojitoxowu/cggtjbP/nadajisoxo.pdfIn PDF document text
    • https://palisuxil.weebly.com/uploads/1/3/1/0/131071308/putejutijuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_601e2cc3c28ae.pdfIn PDF document text
    • https://cdn.sqhk.co/butixasa/gojjeiU/simple_business_impact_analysis_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/momewoziwoge/ileZ12L/90595195476.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/k6YhbN9/inspector_morse_episode_guide_imdb.pdfIn PDF document text
    • https://fulotetaputu.weebly.com/uploads/1/3/2/7/132740707/944a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467564/normal_5fca5ed03015b.pdfIn PDF document text
    • https://cdn.sqhk.co/bodevoposuji/j3Jhghf/veteran_car_run_crash_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/jewjxha/pinatagram_promo_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_60112e6cd94a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_18dca5a3822f4408aa18df3a2fe8356c.pdf?index=trueIn PDF document text
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_82eb18af4f3c4090a2bc3501149648e7.pdf?index=trueIn PDF document text
    • http://gerosopidazab.rf.gd/60156605217.pdfIn PDF document text
    • http://xupanapil.epizy.com/52231245295.pdfIn PDF document text
    • http://pebeminozari.epizy.com/the_national_anthem_trumpet_sheet_music.pdfIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_efde3a8e9ad741578e07c052747efe61.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_73c5623266004c6ba52563f5e4636eac.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 5372 bytes
SHA-256: 852cce78e9021ba5138831243dfc17fff9174b390b40a73571505ac1dc2eb1fe
font_01_sfnt_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 10304 bytes
SHA-256: 40f45625bc83b8a9c798be4a9d3ac0ea14d50f0ad2e69c6ce87af4a99621e2f4
font_02_sfnt_off00013d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D55 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f