Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec23a474e260b53d…

MALICIOUS

PDF

85.4 KB Created: 2021-01-06 20:25:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4050bdc992f127b01d670be1954cb593 SHA-1: 969c5b907a563b5b46ffcbdadeddd56e59d7a45e SHA-256: ec23a474e260b53d60473308e60ba15c91d279bfbd4ac8589cb12e0bd71819b2
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with one prominent link pointing to 'trafffi.ru', suggesting a potential phishing or malware distribution site. The document body, though heavily obfuscated, contains text related to 'Algebra eoc practice test answer key', which serves as a lure to encourage user interaction with the embedded links.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/123?utm_term=algebra+eoc+practice+test+answer+key PDF link annotation
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/217551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_5fbec8a39ce1f.pdfIn PDF document text
    • https://vesanawe.weebly.com/uploads/1/3/4/6/134602832/jezolovefalowi.pdfIn PDF document text
    • https://zafugetab.weebly.com/uploads/1/3/4/5/134502131/da8007ad.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/08cf09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9371d4e-333a-4d99-87c0-c5e2b70c6926/matrix_exponential_calculator_wolfram_alpha.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/703db3ac-ad9c-44e3-93ac-0339ebfd05c4/angora_rabbit_breeders_association.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/895473ae-1064-4f57-ad9d-428d1a9d6c77/3133010325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e15c89-3888-437e-a044-9148883512ea/45926660010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ac3d49-d42b-45a5-9723-b613ec217d55/fab_five_michigan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b78256a-4297-4d02-b29d-fc6fa730e6aa/ion_store_debrecen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4135954e-ae55-47bf-823b-4adf620ccfed/30954642164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ed4bf0-15da-47a2-8dfc-6a83d3e267ba/xixexikikadukedukukigabid.pdfIn 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_off00010eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFF 5488 bytes
SHA-256: d2b288648f962fea1e969a3b7d4e55118faece9239821e0c56363d1ff4d8cce7
font_01_sfnt_off000121cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 11556 bytes
SHA-256: bf09902902f346353b8078141a65ded938526ba0b68c18e9ca02c6278a17ee11

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