Malicious PDF — malware analysis report

Static analysis result for SHA-256 8573d3fa62bbb5fc…

MALICIOUS

PDF

76.1 KB Created: 2021-05-15 12:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 89695e37e1d7f33b4ca43116189045be SHA-1: 27315608ddb9f3e2878a9c0e81e9cb9d9533c1fb SHA-256: 8573d3fa62bbb5fc7646fd54b95ae031203097ab4828b22a2cdd94464681e3a8
156 Risk Score

Malware Insights

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

The PDF file is classified as malicious by ML and ClamAV, and contains a large number of external links, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, suggests a lure related to an essay. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the intent is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://nipisod.ru/strik?utm_term=does+class+size+matter+essay PDF link annotation
    • http://smeh-mif.space/28168763505lh9ka.pdfIn PDF document text
    • http://opencabinets.xyz/how_to_fix_my_samsung_tablet_black_screenb6xr5.pdfIn PDF document text
    • http://wowitaly.pro/sekurojuworagonl2zuy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377391/normal_5ff8156e19d91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488806/normal_5ffb5bae73764.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369802/normal_60086907f3f37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499317/normal_5fde865c59f69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413002/normal_5fd7f87de7fbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405202/normal_5fe78d2544f6e.pdfIn PDF document text
    • http://igcopyrightclient.com/85546054726tju6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408481/normal_6062eb89395cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab0007c4-58ca-4db2-ab23-686bae4d53c1.filesusr.com/ugd/8bf248_c76cd3f8dcab442596fdd105e3605506.pdf?index=trueIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_0360c21e5c3942558b999b0cac3d8d89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fopalew/magic_bullet_army_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/maytag_neptune_gas_dryer_parts_diagram.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_d9c088b1ed00453787a4b10f2fcf9013.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/jotumaxajitewijatususol.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/retribution_and_deterrence.pdfIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_b6723f5fec45414cb095f5b8c656ef82.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_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 5096 bytes
SHA-256: 560ee0a288db7711f64e4030a5f9102341b6854910b2eb064b5ec9479137250e
font_01_sfnt_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 10608 bytes
SHA-256: fd15a3bf1e0f9d02f1686d3665ff22469cc2efa3ff240ddded06febecf9cf603

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