Malicious PDF — malware analysis report

Static analysis result for SHA-256 374ec405374a1e37…

MALICIOUS

PDF

74.3 KB Created: 2021-05-16 17:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 54d4ccc8e1acaa734c4ea7633a8196f0 SHA-1: 876f337f77d60b67638c9f2be3d9b8539057680d SHA-256: 374ec405374a1e370b841bd892fd3869dcf60bae63d7473f411d228f67b745e9
186 Risk Score

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 0.9997

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/strik?utm_term=judo+techniques+chart PDF link annotation
    • https://nasoxuxelaleve.weebly.com/uploads/1/3/4/7/134744481/46c21.pdfIn PDF document text
    • http://com-connexion.xyz/40171607472vq12i.pdfIn PDF document text
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/tisij_lugobutes_kovuden.pdfIn PDF document text
    • http://you-bestshop.xyz/venn_diagram_reasoning_questions_in_hindi4m12w.pdfIn PDF document text
    • https://girusidopot.weebly.com/uploads/1/3/0/7/130738876/3234172.pdfIn PDF document text
    • http://xoxanuf.mygamesonline.org/recetas_de_comidas_vegetarianas_peruanas.pdfIn PDF document text
    • http://gnfcns.info/magic_mouse_2_review_2020dmcib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_6802eda363484c4e8a89b47571896524.pdf?index=trueIn PDF document text
    • http://zokaramizixa.atwebpages.com/wolaranulidetebuzefanu.pdfIn PDF document text
    • http://vekejuf.atwebpages.com/lupixozati.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/23159417495.pdfIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_1dcbba40f63f4a83862875dcaec7f6aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupoti/troy_bilt_lawn_mower_bag_frame.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/nuxowanuxutexo.pdfIn PDF document text
    • http://wobadumiravolu.atwebpages.com/cricket_rules_2020.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_b31fcc28633748e79c4a73ec5fe919ed.pdf?index=trueIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_3090ecf2e0de461db7309561c618225a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/war_and_peace_tv_series_2007_cast.pdfIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_a54eb61b10f94ed0bbb5940b320b09a0.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_e416925f978a4f088c3a03d27f9b4b6d.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_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 5108 bytes
SHA-256: 4442cff34fda28a71905733b19400d90e9d08ed4396a601b94e3a6a89d2c16c2
font_01_sfnt_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 10720 bytes
SHA-256: fe4977a196d6fb505b92dceee22ce5afe5efdbd516c84dd4cbfc43d172c981f7

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