Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a63d6232077640…

MALICIOUS

PDF

73.2 KB Created: 2021-01-15 01:11:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3ba1f405128b8c3a497169bb3f56059e SHA-1: 713a9c907aa3d93960c3eb422ff26026f4d44432 SHA-256: 82a63d6232077640fa40a3b1ab8ebf0cb1df3e19ef69af38964b15d79fab8b2d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a phishing trojan. It contains a large number of embedded links, many of which point to link farms and known malicious redirectors. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its intended lure beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=another+word+for+greatly In PDF document text
    • https://nulakumoxuguv.weebly.com/uploads/1/3/1/8/131871970/986845.pdfIn PDF document text
    • https://zurirepazigotot.weebly.com/uploads/1/3/0/9/130969164/837e4413a62f0d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5f931700a651e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407066/normal_5fefcfab8521e.pdfIn PDF document text
    • https://site-1175017.mozfiles.com/files/1175017/jexepegexol.pdfIn PDF document text
    • https://site-1172089.mozfiles.com/files/1172089/24700011638.pdfIn PDF document text
    • https://site-1194807.mozfiles.com/files/1194807/bubble_spinner_match_3_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f992f997a2ff.pdfIn PDF document text
    • https://site-1233605.mozfiles.com/files/1233605/gozabenivaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_5f97c3770ef9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/57221879134.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/38784201310.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/kendrick_lamar_adhd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/deriving_suvat_equations.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/sustainable_development_examples_companies.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/musaregupudomefos.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_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 5172 bytes
SHA-256: 2f1446a49a46b9d116ac117c6828123b92301f0c50d66823eb4f02cbe1f8f8e3
font_01_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 11180 bytes
SHA-256: b99d7ad950cda8983698d0fbfcad141bba105c12b3ae21ec88fe582c3390bf18

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