Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f5318fd7caf728…

MALICIOUS

PDF

78.6 KB Created: 2021-03-15 12:56:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7e351580e80486e0165701b500638c02 SHA-1: 222321f21abe57d5c59bf5dac7302d405cebfe6a SHA-256: f8f5318fd7caf7288c283da7e9d2f12fdb0f3cf723f6c6ab969777076f4b260a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=dawoodi+bohra+marsiya+pdf+download PDF link annotation
    • https://kutinimi.weebly.com/uploads/1/3/4/6/134608846/9758710.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/papiwi_xapokujadeg.pdfIn PDF document text
    • http://regivag.iblogger.org/air_force_ones_womens_colors.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/maparujopavatexlu1ni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409420/normal_6004e7a580898.pdfIn PDF document text
    • http://paganel.world/90144567641blu2c.pdfIn PDF document text
    • http://waystep.site/2784149741449ror.pdfIn PDF document text
    • https://vomuxetajamusu.weebly.com/uploads/1/3/1/8/131857717/33936a3dea4.pdfIn PDF document text
    • https://buralekareze.weebly.com/uploads/1/3/4/3/134326789/9604703.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/vavabobavawikalejoviroman.pdfIn PDF document text
    • http://vukuwupevipe.iblogger.org/aprendizaje_colaborativo_definicion.pdfIn PDF document text
    • https://wojosonasejedop.weebly.com/uploads/1/3/4/6/134613238/fivid-bukulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477155/normal_60496ebb99349.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/how_to_open_wall_safe_gta_5.pdfIn PDF document text
    • http://beweroxaku.66ghz.com/24572856495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_60273dd0922a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_630bbe22fb3944729f823ab2641a61af.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_4f1ecaf99ead433dac4f7f36184217cf.pdf?index=trueIn PDF document text
    • http://mivowejow.rf.gd/kesuse.pdfIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_cc0f27a3cfa24ec19766cec90d0f9cce.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 5616 bytes
SHA-256: e380c7c862cdde64bb508b4cb4bd862a4b74516db17f3a69faa461ef01c3445f
font_01_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 10828 bytes
SHA-256: 7194624d1a13cc76ce9e8f014a427c10a19467b67d3559bb2275fa06b5491ae5
font_02_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 17896 bytes
SHA-256: 819d53f3e2a5476d9d1f98aa68c70fa607a581732cb0419f1336af15c9ed1533

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