Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bc11a013cf0ba7…

MALICIOUS

PDF

70.9 KB Created: 2021-04-03 11:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7760cb54620c542174289cf78460c1ca SHA-1: 8379c3e680a3dd0441d2d6d15036c68f0042b8d5 SHA-256: b5bc11a013cf0ba775e1f6e2105bfd40de9688c37bd1f2fb152f25ad6f2ba86b
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-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://vilenefex.ru/strik?utm_term=romeo+y+julieta+cigars+price+australia PDF link annotation
    • https://xidekudogigut.weebly.com/uploads/1/3/4/6/134683706/basox.pdfIn PDF document text
    • https://zunotexiru.weebly.com/uploads/1/3/4/8/134890048/vavenaram.pdfIn PDF document text
    • https://gopogusefivow.weebly.com/uploads/1/3/1/4/131406686/wifurejes-voliferadiwix-peninogevusotu.pdfIn PDF document text
    • https://zusabave.weebly.com/uploads/1/3/1/4/131406295/5598037.pdfIn PDF document text
    • http://igcopyrightclient.com/retivizukenewikufidruhfc.pdfIn PDF document text
    • https://siroxexorap.weebly.com/uploads/1/3/0/7/130739693/6344390.pdfIn PDF document text
    • https://mogomanazeveka.weebly.com/uploads/1/3/0/9/130969503/6a9c8837.pdfIn PDF document text
    • https://kimiragijasem.weebly.com/uploads/1/3/4/0/134096233/1272388.pdfIn PDF document text
    • https://joxoxego.weebly.com/uploads/1/3/4/6/134664344/352fc411.pdfIn PDF document text
    • http://verifybadgehelp.com/vodonovojezepuwirakipmz4cn.pdfIn PDF document text
    • http://mebets.xyz/acetic_acid_5_safety_data_sheetrtbnt.pdfIn PDF document text
    • https://xadadoroz.weebly.com/uploads/1/3/6/0/136024884/7574218.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_144798cb12204daeb95624102d92ec7c.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_de4ae46fa08243549df4d46345f580ee.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_d8435db1a30e4d238446f40563fa0cf1.pdf?index=trueIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_dfd0923b1d504771bb7970c7e2052fc2.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_b413691c3dd04022a6ad2bc89a756b94.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC653 5216 bytes
SHA-256: c87371ebd71595922433a6a11825362b2fcd5857b0f2d6c6935ae54fab8c2e1b
font_01_sfnt_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 11216 bytes
SHA-256: 9d500c818676d35c7e7a3a4750eef2a294792fe68be4d2015706c737cc3dd4b4
font_02_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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