Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ad49c4f6f8a3bd…

MALICIOUS

PDF

73.9 KB Created: 2021-06-11 06:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d1d87baf6c9a3d3c306a1ea45ae157b SHA-1: 7c1c0924e4cde75ffc29b4ce7f4752e8815a4dfa SHA-256: a5ad49c4f6f8a3bdbf177928450c00e568a57492215697cb52eb87c707006f58
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various platforms, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/123?utm_term=libero+tracking+sheet+for+dummies
    • https://cdn-cms.f-static.net/uploads/4411709/normal_6065ffd9831b1.pdf
    • https://rasaputale.weebly.com/uploads/1/3/5/3/135323831/6288139.pdf
    • https://supimoxu.weebly.com/uploads/1/3/5/3/135319300/2142462.pdf
    • https://xasirazabad.weebly.com/uploads/1/3/4/6/134699738/1079533.pdf
    • https://bapejezobo.weebly.com/uploads/1/3/7/5/137513383/4660521.pdf
    • https://wupizesave.weebly.com/uploads/1/3/4/5/134581048/5466526.pdf
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/847935b78632fc.pdf
    • https://tagalevef.weebly.com/uploads/1/3/0/8/130815582/tiburibotum.pdf
    • https://pimelitapata.weebly.com/uploads/1/3/1/4/131454500/adb26af.pdf
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/d59613.pdf
    • https://static.s123-cdn-static-d.com/uploads/4464722/normal_60b45d4b6f8ff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b329b13b-87f0-4b75-ad9e-468c95f33ea1/giwadulununelozabewuru.pdf
    • https://uploads.strikinglycdn.com/files/7683837d-635a-432d-a843-a4bac5a28cd5/is_dark_series_ended.pdf
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144471012/what_are_the_four_key_performance_indicators.pdf
    • https://uploads.strikinglycdn.com/files/c2ff8f61-ec8b-4f07-851e-795420a8aa1a/10809821028.pdf
    • http://buzivevej.pbworks.com/f/69949279110.pdf
    • https://uploads.strikinglycdn.com/files/9b9f8848-d2c0-4e90-af2e-9d3d90be068e/lojedukulu.pdf
    • http://sawebaz.pbworks.com/w/file/fetch/144799854/how_to_extract_text_from_image_in_using_python.pdf
    • http://biwonuv.pbworks.com/w/file/fetch/144473403/slendytubbies_2d_download_pc.pdf
    • https://uploads.strikinglycdn.com/files/8c860036-f25d-443e-83a9-6c9418effa51/rumobevomosakefagizuda.pdf
    • http://jubujefaj.pbworks.com/f/dixitigipevajube.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_off0000ea13.bin
3e1b274d4f2cc1f3135806d264ff435233cd9fba0e357c7b87cfbe18f38a2a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 5548 bytes
font_01_sfnt_off0000fccc.bin
4425efa2eb05d22cb8d4269bc0a23a4868260328ef6658522d61e68485ee26f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 8652 bytes

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