Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6173f4705a51a1e…

MALICIOUS

PDF

76.9 KB Created: 2021-05-03 00:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 663af2351ab24d7ccd415bff641cef76 SHA-1: 7107f190955557adf9b3103eefccef75edfac7ce SHA-256: b6173f4705a51a1e3a273486cc98344329d0ddb3211563d627916eaa812cbf90
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://jumiwimov.ru/strik?utm_term=harry+potter+house+quiz
    • https://zawiwiguxasawum.weebly.com/uploads/1/3/0/7/130739629/rafeniwunerimuvaril.pdf
    • https://vosojexurixug.weebly.com/uploads/1/3/1/0/131070535/0020597.pdf
    • https://bidekefit.weebly.com/uploads/1/3/1/6/131606331/wazuwigepazin_tiwibuxaro_semajunabuxik_midudeval.pdf
    • https://sesifubonimexa.weebly.com/uploads/1/3/5/3/135317238/e83821.pdf
    • http://vivekawiga.sportsontheweb.net/58623703033.pdf
    • http://xapiduxirob.mywebcommunity.org/41261045163.pdf
    • https://taxamoxegira.weebly.com/uploads/1/3/4/8/134895948/tadiwopamoxet-kodawoboto-xojegifan-rigapubowes.pdf
    • http://fejiximodanu.mygamesonline.org/bbc_compacta_class_11_english_answers.pdf
    • https://badexakabenal.weebly.com/uploads/1/3/4/0/134017850/zusupivazofatod.pdf
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/878167.pdf
    • https://jimuvidagonolab.weebly.com/uploads/1/3/1/6/131636746/mulonaguguzomo_feteto_lividebazipiro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ff8788bd-1d63-468a-af1e-9a4b138a8185/48543453930.pdf
    • https://s3.amazonaws.com/paxunu/72707671482.pdf
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_48cd5292283a402ea2cad1f16d0db79f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2ab1ce7b-4611-4db9-be67-b4350281808a/does_bob_evans_have_any_specials.pdf
    • https://4e4608fd-868e-43f5-b6ba-14e5e4b50785.filesusr.com/ugd/b1f235_ef451d1e7d9e4d5993736692ffee991b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2b12138c-e27a-4e53-9e5b-bbbc5f39cf33/public_speaking_anxiety_tips.pdf
    • http://susabumo.atwebpages.com/baraxoxakaralomorabezisen.pdf
    • https://s3.amazonaws.com/rujabepifar/guidelines_to_writing_a_letter_of_recommendation.pdf
    • https://s3.amazonaws.com/nisiwanolom/fifo_excel_spreadsheet.pdf
    • https://uploads.strikinglycdn.com/files/554c1700-f624-46df-809a-d4d3d1ea1d8d/53130531146.pdf
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_8515f6d634504e3cb7fe7c2b7789de75.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea8.bin
9c8ce0beb9a244cc3bd1bafe92b4f7e7595664c5539f675bf1b7ef9b92ff2a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 5116 bytes
font_01_sfnt_off0001001b.bin
e03598b788ebc5b00c78c784d1f7fae0e54d29af615bc431972e0514cfba08fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 11348 bytes

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