Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5ae85d87d914c7…

MALICIOUS

PDF

102.3 KB Created: 2021-01-01 06:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: aa5d6ec9e1b9353f5ad40526b77416c3 SHA-1: 5a5eab48d7925d6ad64d9aa59fa2cf5b6ea3a2e9 SHA-256: 3e5ae85d87d914c7e4bea075a06c39d2815c6633b2dc155964bc0a3dabc7199e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to game guides, which is a common tactic for social engineering.

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://traffnew.ru/aws?utm_term=guilty+gear+xrd+rev+2+characters+guide PDF link annotation
    • https://numuxubolab.weebly.com/uploads/1/3/4/3/134382028/tedulelekugavanida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414677/normal_5fbbf9b01fe34.pdfIn PDF document text
    • https://ronisimene.weebly.com/uploads/1/3/4/6/134610282/kiruk.pdfIn PDF document text
    • https://xajupodesuze.weebly.com/uploads/1/3/1/3/131380723/kosax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_5f983cb6c02cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_5f90091f03fa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_5fa215f2d966b.pdfIn PDF document text
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/6294999.pdfIn PDF document text
    • https://godivibodo.weebly.com/uploads/1/3/4/0/134040440/lanilaxizatiduli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388596/normal_5feeaa332e1b5.pdfIn PDF document text
    • https://dovogejeromew.weebly.com/uploads/1/3/4/6/134666082/zuvid.pdfIn PDF document text
    • https://padomixuboji.weebly.com/uploads/1/3/4/5/134527159/tubidunaxojo-folimebiloru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_5f9f1fba1460c.pdfIn PDF document text
    • https://letenusesek.weebly.com/uploads/1/3/4/3/134310332/rajoxoga_jevororamub_mamiwotidaxuk_ratuziba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00012395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12395 15380 bytes
SHA-256: 77a9951ae862174b243f4b37d940d957395cd718db1c88572e3faa29d70c5aa7
font_01_sfnt_off0001544b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544B 5596 bytes
SHA-256: b96af3db20c5a50f189198cdb3cbe79866c1d205589ef615b1fc04fa5022be47
font_02_sfnt_off00016765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16765 10568 bytes
SHA-256: 18b94ea3946070e58b0add3d61374e3fead1ac1b7f579642020e45548455a1e1

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