Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4619d93c8ac2dad…

MALICIOUS

PDF

71.4 KB Created: 2021-03-17 16:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2239676bb732bef9be0012c12e5d38b3 SHA-1: 79b8f47d359de69117517a6828cbcea47f923dce SHA-256: f4619d93c8ac2dad565614db9ff4ac53e0f792f433f6358fdf60f462ac3b8915
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/wix?keyword=thinking+critically+about+ethical+issues+7th+edition+pdf
    • https://galofufe.weebly.com/uploads/1/3/1/3/131384583/sivulekelaxomi.pdf
    • https://cdn.sqhk.co/rufopunuk/yicidig/96091811062.pdf
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/visoderuzegavare.pdf
    • http://fuvisetitisenon.mypressonline.com/fatores_de_risco_cancer_de_pulmao.pdf
    • https://kexibisurek.weebly.com/uploads/1/3/4/3/134334279/86f7635c4aa.pdf
    • http://kiparegazeratax.getenjoyment.net/where_can_i_donate_baby_clothes_in_los_angeles.pdf
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/guzotaj.pdf
    • http://palupalukagu.mygamesonline.org/olympus_om-2_repair_manual.pdf
    • https://nebekateri.weebly.com/uploads/1/3/1/1/131164314/5058751.pdf
    • https://cdn.sqhk.co/puranajav/hajdF9r/36368692904.pdf
    • https://neranoliva.weebly.com/uploads/1/3/4/2/134266014/tifimuv-luxowu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eb857a06-b451-46cc-8460-74421f1a0e14/38359578954.pdf
    • https://uploads.strikinglycdn.com/files/aba1e27b-6f20-4067-aa44-4613ce60064a/40008219337.pdf
    • https://s3.amazonaws.com/dibedamoka/adobe_reader_free_file_hippo.pdf
    • https://s3.amazonaws.com/wemazun/subtitle_film_bad_genius_2017.pdf
    • https://s3.amazonaws.com/lumixi/15993942174.pdf
    • https://s3.amazonaws.com/gudukupir/worojivavabogerurikosomag.pdf
    • https://uploads.strikinglycdn.com/files/620de196-385b-4cc1-9c75-2bfbd830c9c7/cuisinart_grind_central_coffee_grinder_stopped_working.pdf
    • https://s3.amazonaws.com/sinadi/itunes_12._10_2.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_off0000d779.bin
8e1a9453f0b9485317ceb3dad3554b563e14a5ad32c676044c50497d2f7d10b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 5752 bytes
font_01_sfnt_off0000eb14.bin
019248478e2cb7c4b25bf50a4da73dd48f2e2421eb3b0f308f17eea7a8add13d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 10824 bytes

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