Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca49f263159a968…

MALICIOUS

PDF

80.9 KB Created: 2021-04-26 00:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ec4464a912a7427b6810830258303ff1 SHA-1: 996ebaef4e7bd012945e0a8e57990e4bd4200173 SHA-256: eca49f263159a968f11627cf9498a5c48daa22b1216de29928839fb5319abf85
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://nipisod.ru/strik?utm_term=avaya+one-x+attendant+user+manual PDF link annotation
    • https://cdn.sqhk.co/tinulafi/bjhjiUm/14667459894.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/jiihhc1/wuvorawapub.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/xihi7hf/nosalunavujimazo.pdfIn PDF document text
    • http://uscarins.info/how_to_fill_a_vicks_warm_mist_humidifiertl663.pdfIn PDF document text
    • http://prodson.fun/tumapologogntysm.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/jdJujam/blocks_and_build_crafting.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/igahjor/angry_birds_pop_2_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/jeibgfQ/89250945591.pdfIn PDF document text
    • http://baffer-shop.space/2047195166610wnr.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/bf6ihIj/schlacht_an_der_marne_1914_zusammenfassung.pdfIn PDF document text
    • http://kutalevewomem.22web.org/85857231179.pdfIn PDF document text
    • http://snail-case.store/resumen_del_libro_la_meta_goldratttrgoh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_8b2c175eb39b46738e344c450477c24f.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_0e0ceb5fb5cc4a89a23c3d0f559de472.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/firelerowoniv.pdfIn PDF document text
    • http://filipebed.rf.gd/autodesk_inventor_2020_user_manual.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_3d7b3d3bdb52419f85961e6019e9dc76.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/18099780409.pdfIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_3fd912634ecd42189a50e7b42cc64ee3.pdf?index=trueIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_b02012392e9b40fd9b9a468679b4c092.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_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 5224 bytes
SHA-256: 8b7ea4773093f49038efc82e5ddad7ace9d27fb10cea2a7cf03e527a7acf7dba
font_01_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 12084 bytes
SHA-256: 781a41097826e3b790e805abd9301b63392fa35cecaf284c91675ed1c881aed6

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