Malicious PDF — malware analysis report

Static analysis result for SHA-256 257c81f8f4ee7dca…

MALICIOUS

PDF

78.9 KB Created: 2021-04-05 18:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3bbf7978ec6ccc085a861a62575cac71 SHA-1: 83a84e7531b4b2e4305c739f81733c1f85a9bef8 SHA-256: 257c81f8f4ee7dcaece21f0b1734ede9f2a01b0493031eb9221fa33af51afcf2
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 0.9998

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://seumenha.ru/wix?keyword=razer+blackwidow+elite+manual PDF link annotation
    • http://zuberisuxivaki.scienceontheweb.net/97047023862.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/jchagct/21578232273.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/norcold_rv_refrigerator_controls.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/geXgdhf/zombie_hive_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/sifujubagis/egiridt/dubetemuridejonoxexiwina.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/monobuxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_7bcf86317b40426182e4d60313bf9fda.pdf?index=trueIn PDF document text
    • https://6346cca1-8be9-442e-91e0-e35201572fa6.filesusr.com/ugd/a8c077_7a6eb4e23cfb4f9988ebb58905eba076.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/kuxoziduwatijo.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_ed4f1e92d2eb455a9731f8a0eb2b84ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/hardie_board_sheet_siding.pdfIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_b4d5c2b24f9d4a23b481694f19704aa8.pdf?index=trueIn PDF document text
    • https://a19d597f-2220-41b3-9459-688249e8a20b.filesusr.com/ugd/f19f53_cd04e9b8db7b47d1af98e4544478590d.pdf?index=trueIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_5e686a00d4a24b9192c3c094645e1388.pdf?index=trueIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_b4e6e6a30e074fcbb55df699c67282dc.pdf?index=trueIn PDF document text
    • https://c9254e9e-0e71-498a-8384-ab4c929b52b4.filesusr.com/ugd/0699ff_58bd7c413dc547d69507082bfba584b0.pdf?index=trueIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_84731551523243db9e0da9c97b4da66a.pdf?index=trueIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_0c8fc190241047f2b55dea9fea13c009.pdf?index=trueIn PDF document text
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_c2cc5da2d8fb4b47816dfc10bc196aad.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_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 5260 bytes
SHA-256: 9d701f649961665c4c4a28551bf8d6968fa0b5a41f6f2a9a9eeb902973d0fa1c
font_01_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 10840 bytes
SHA-256: a01753aa10b45e467edfa081210b6611a2246aebf712ded2c0a93197bdcb7a32

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