Malicious PDF — malware analysis report

Static analysis result for SHA-256 9311ac3dec1041a7…

MALICIOUS

PDF

80.9 KB Created: 2021-04-04 21:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 250ecc77c21614b12f96d1af6bd5ea34 SHA-1: 02cfb9a35f86b00851135416ab858ac7fcd7fac8 SHA-256: 9311ac3dec1041a719e2e23a5e747f4978be2b5d488ec20b31567065c979434d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the link farm point towards an attempt to exploit user interest in specific topics to drive traffic to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=abraham+hicks+money+and+the+law+of+attraction+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415524/normal_6027cc98c2d5c.pdfIn PDF document text
    • http://leaninrzpd.site/arma_virumque_cano_in_english990lu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460449/normal_6050191c519eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5fd85a5661b68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379615/normal_5ff25ac27b563.pdfIn PDF document text
    • http://remont-pc.website/puxifijobeyz1ir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_60464bb084e78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491671/normal_5fe4d12a3b36c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487187/normal_5ff8622da5656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_6040c1ecead33.pdfIn PDF document text
    • http://creamwalls.space/crown_cmmteik3.pdfIn PDF document text
    • http://onlinekartiadesi.com/kipevakuxemikezojuwula3uzjh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_60395f8a3f484.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421339/normal_60006172bcbe1.pdfIn PDF document text
    • http://silvanozito.online/beginning_and_ending_sounds_worksheets-_1st_gradegpgdl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_441d8465725c4edfba36dd3c0aa0761a.pdf?index=trueIn PDF document text
    • https://2ce49c0c-752a-49d0-a831-a69229ee2afe.filesusr.com/ugd/6e9521_30bdfaaf7b35440fa0fe1baa6dab6c0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisik/78407485155.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/39489726325.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/how_to_start_an_interview_essay.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_53b3a141d5fe445ca4fc6c14b05ef4b0.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_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 5784 bytes
SHA-256: c84278c39e63f0dbbea5ab471707f0fba699b784e27d5c155e49cab60f0fa708
font_01_sfnt_off00010e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 12244 bytes
SHA-256: 0af56a9f79d0df1ef465dec6c19ca8f491086d8f651852d970f99bfb124b406e