Malicious PDF — malware analysis report

Static analysis result for SHA-256 160b6f5ab716e6cb…

MALICIOUS

PDF

76.7 KB Created: 2021-04-05 03:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ea41f4ff22795f83738b84ed6a33a44 SHA-1: 8f0e75b0e1397c1ca77aa999cba86270eb3a1fac SHA-256: 160b6f5ab716e6cbb4f2d85b167dd212e8ee5627b37127f8a76d8b3b5274f442
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to Weebly-hosted PDF files, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically as a phishing or trojan variant. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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=can+cricut+expression+1+connect+to+computer
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/bagusudoxekej-ladetupejolirok-xerig.pdf
    • https://lirefabagobaxi.weebly.com/uploads/1/3/4/0/134012393/xemuvixonoti.pdf
    • https://kesizibewasi.weebly.com/uploads/1/3/0/8/130813921/97a32179.pdf
    • https://xufujume.weebly.com/uploads/1/3/4/8/134851049/8327516.pdf
    • http://naxajogilelog.medianewsonline.com/notitub.pdf
    • https://wawisutifefot.weebly.com/uploads/1/3/0/7/130739430/6305161.pdf
    • https://sazopugewado.weebly.com/uploads/1/3/1/4/131453094/zoturaxoxopu.pdf
    • https://todilotifobaw.weebly.com/uploads/1/3/2/7/132712516/tusoxokusegexesilej.pdf
    • https://cdn-cms.f-static.net/uploads/4370264/normal_605bef0d693de.pdf
    • https://cdn-cms.f-static.net/uploads/4377662/normal_603e97b59806a.pdf
    • http://neriwor.medianewsonline.com/batavunesigefagipil.pdf
    • https://puxosuloboja.weebly.com/uploads/1/3/4/6/134677226/0c6c59b06f51d.pdf
    • http://xorabawik.medianewsonline.com/99709750094.pdf
    • http://nedavupagisezim.mygamesonline.org/what_are_the_four_principal_parts_of_the_declaration_of_independence.pdf
    • https://tadirexexex.weebly.com/uploads/1/3/2/6/132695418/javulagofuwe.pdf
    • https://static.s123-cdn-static.com/uploads/4473062/normal_5fff753e96bef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e898fc9f-4219-4f2c-9427-27e7e3f8e0a9/bear_archery_cruzer_g2_rth_compound_bow_package.pdf
    • https://uploads.strikinglycdn.com/files/7e11c76c-8cfa-4467-9afb-773155e36d52/62278925507.pdf
    • http://nejesezape.myartsonline.com/wanokabak.pdf
    • https://uploads.strikinglycdn.com/files/30e62a86-eb14-4788-9466-d2a5498938e0/jexituzum.pdf
    • https://uploads.strikinglycdn.com/files/c9838f50-1391-4978-b3ea-1b2eb5f7efe8/zosani.pdf
    • https://uploads.strikinglycdn.com/files/8dcc7bf5-c7d9-4f4b-8840-17c79836eed6/vijojuvinuzojenomas.pdf
    • https://uploads.strikinglycdn.com/files/f847d939-d5cb-4870-875a-f703a0de75ef/how_to_say_goodbye_in_native_american.pdf
    • 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_off0000efe8.bin
ba2cfa0f90f8fdf0633006a707b8918a5f7ea5e57a3c97ff16cfb79049f019b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 5072 bytes
font_01_sfnt_off00010117.bin
514065a0850e2098f9a689dddbbc2059f04cf3f071016c5e0c1249be6cb5d23c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 10584 bytes

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