Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46991977902b452…

MALICIOUS

PDF

82.3 KB Created: 2021-03-20 14:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c9447a0133ca5c9b950c3844a607a874 SHA-1: 2883ed602e034939fbcc2bf23dd66e3a1003a59c SHA-256: d46991977902b4520dfb6a28bb020f4df4e252f9f49f3652c9dca7d7f9f0d018
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farms suggests an attempt to direct users to potentially harmful content or to manipulate search engine rankings.

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://dafemum.ru/award?keyword=substitution+reaction+organic+chemistry+pdf PDF link annotation
    • https://bipixivosebik.weebly.com/uploads/1/3/4/5/134516267/e3e4674d65.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/bdba7294faa0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5fe971bc59360.pdfIn PDF document text
    • https://jewelalebun.weebly.com/uploads/1/3/4/5/134585336/zipori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_5fd2eabf7f31c.pdfIn PDF document text
    • http://akfb.online/how_fast_does_a_kawasaki_bayou_250_goz28gw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_5fd2aace76650.pdfIn PDF document text
    • http://zotonurapad.22web.org/my_cloud_wdbctl0020hwt-eesn.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/06c570060a93.pdfIn PDF document text
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/zelijim-toruvovi-zinarex-dexeb.pdfIn PDF document text
    • http://faketikus.22web.org/asvab_study_guide_online_air_force.pdfIn PDF document text
    • http://uk-delfin.ru/how_do_you_change_the_date_and_time_on_a_nortel_networks_phonej77kn.pdfIn PDF document text
    • http://accface.in/tevotumitvkxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_11c0db156d8941859162f4e606ce5782.pdf?index=trueIn PDF document text
    • http://rewejuvozotu.epizy.com/alter_ego_b1_french.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_a660099034154b0994ec43ed0632bf82.pdf?index=trueIn PDF document text
    • http://fuvogixus.epizy.com/98755929042.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_030f93c4fc544665bb142f218d63246a.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_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 5884 bytes
SHA-256: 7f0082e3afe2325bf320bc58ba78a3a5fddbc898acd3c8d3dcbcdb1c32308bef
font_01_sfnt_off000116a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A3 10836 bytes
SHA-256: 8c48618ae5cfab094a018ce1636cd5f571926ebc7a283f05a0c3c04c84633b9f

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