Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6647aff8aee36b…

MALICIOUS

PDF

85.5 KB Created: 2021-03-24 00:07:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e981ad7b0304a811a984211df0e7be4e SHA-1: 21a61d8a953bea1e272f990244381033e405f875 SHA-256: ab6647aff8aee36b151537ea3bf55d36281c8731e68a1447ecdf77677cd95791
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful websites, likely as part of a phishing or malware distribution campaign.

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://resalured.ru/wix?keyword=actex+fm+study+manual PDF link annotation
    • http://sovetnik53.ru/what_does_a_vegetarian_bodybuilder_eatpe3z4.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/hhjLFhi/green_pumpkin_squash_types.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/ihjjbhd/fibefiso.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/hdjbBn2/40767194245.pdfIn PDF document text
    • https://cdn.sqhk.co/sirezozere/gfjghio/11588329344.pdfIn PDF document text
    • http://arenda-comp.space/54885910023eeo1.pdfIn PDF document text
    • http://graatorama.fun/facebook_audience_network_ios_sdko1323.pdfIn PDF document text
    • https://cdn.sqhk.co/kebabefepu/hfTthhd/81903781717.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/hdjarhe/nogewo.pdfIn PDF document text
    • http://ilkertr.shop/87384557764b3ogg.pdfIn PDF document text
    • https://cdn.sqhk.co/razilipot/jhikGid/bagawogulenuvosagufanogul.pdfIn PDF document text
    • http://anyita.space/minecraft_pc_free_1._126m9xz.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lenubavezuvutu.rf.gd/vibibobogirijelogafamolik.pdfIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_6a4001339cd34ee089b7aa8c5cd6644c.pdf?index=trueIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_977cf07f74104269bf13412f3358e41e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/284407d8-b22b-40b2-9fbb-2d0fd108ac8c/how_to_clean_wolf_oven_top.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51710da3-70b4-4847-b57b-81f1a3c15769/saxulegogedopewapukalita.pdfIn PDF document text
    • http://lenaxepejo.rf.gd/a2_english_vocabulary_test.pdfIn PDF document text
    • http://wefebasutij.epizy.com/69957150945.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 2844 bytes
SHA-256: 8ef6ef83324e2f39cf535f6285f4908f6ce0a80c20618967bd1c58a441031137
font_01_sfnt_off00010e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 5228 bytes
SHA-256: f737403591dbe3da7641a8ca2535c516daff5afe0b4d2c1d266ad88cb99648ae
font_02_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 11896 bytes
SHA-256: 05b75dd0b322205cba3cee1ed8dcb3d8e2721b07b4deaf1676ca4c151a4b4c8b

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