Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99892d7df67d5fa…

MALICIOUS

PDF

75.5 KB Created: 2021-03-15 10:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b3ab19b08e74f8de222850adbac9674 SHA-1: 78f44f22d5ab829bf7543e9e0fd9eb8d306647dd SHA-256: a99892d7df67d5fa1ecb336f0b9c9f65c7e52d731b2889e55d712b0e6bb00f6e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to 'seumenha.ru'. This heuristic, combined with ClamAV detection and ML classification, strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful content.

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://seumenha.ru/strik?utm_term=how+apply+nail+stickers
    • https://static.s123-cdn-static.com/uploads/4459645/normal_5ff94fe564cff.pdf
    • https://cdn.sqhk.co/minamojazi/dkEiahi/rexovavixuk.pdf
    • https://static.s123-cdn-static.com/uploads/4389599/normal_60018a9695f78.pdf
    • http://pukebebizadolu.mypressonline.com/75228307978.pdf
    • https://cdn.sqhk.co/sudidoxa/fifgeia/19516745388.pdf
    • http://zobotalemogi.sportsontheweb.net/salary_of_operations_research_analyst.pdf
    • https://cdn.sqhk.co/vedasukuki/eyJiQry/verizon_roadside_assistance_telephone_number.pdf
    • https://static.s123-cdn-static.com/uploads/4416304/normal_5fde943557d49.pdf
    • https://static.s123-cdn-static.com/uploads/4369158/normal_5fce4fd01f639.pdf
    • https://cdn.sqhk.co/zopinulepa/iheiejd/download_frisbee_forever_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4480748/normal_5ffc984a2db26.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pasawexawinogad/easy_stone_soup_recipe_for_classroom.pdf
    • https://s3.amazonaws.com/jolituzoji/wedding_posing_guide.pdf
    • https://uploads.strikinglycdn.com/files/afc77591-3c9a-4476-a3a9-57d8a5f98621/karcher_pressure_washer_wand_replacement.pdf
    • https://s3.amazonaws.com/mamukawaxatali/validity_and_reliability_of_questionnaire.pdf
    • https://s3.amazonaws.com/fatikonavori/android_pay_paypal_nfc.pdf
    • https://uploads.strikinglycdn.com/files/701ed678-618d-466a-9687-de21408b3ea2/who_owns_moon_river_ranch.pdf
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_54214f1973a94a83a83fb08f34e97938.pdf?index=true
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_73aea5a4ad3f4ed1a850a1872f96ea18.pdf?index=true
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_d350cac285e04c689743dc93911ea4be.pdf?index=true
    • https://s3.amazonaws.com/xumakomowi/faxowutixopime.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_off0000e789.bin
ed57ff73c5c69ffb513e26f6772dbe5114d47752138ed96c623e265ed1a2fb1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 5144 bytes
font_01_sfnt_off0000f930.bin
499fee6a5eb15d0e61c1ce615448e0def9ad799c8ff98958bc9a5926efd70e75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 11840 bytes

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