Malicious PDF — malware analysis report

Static analysis result for SHA-256 258b508dcb35a596…

MALICIOUS

PDF

93.1 KB Created: 2021-01-15 20:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f9c1616c65d1a6fc34f14f2cb58fa598 SHA-1: 14173ec871b4ba9c8aabf35a95dffc2625fce775 SHA-256: 258b508dcb35a59680e1c068dbc758e2cd63c35ee3912e1e2ab0058c5cc2d5e1
214 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and a large number of external links, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution lure, likely using JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=dell+latitude+d630+upgrade In PDF document text
    • https://site-1185731.mozfiles.com/files/1185731/electronics_workbench_tutorial.pdfIn PDF document text
    • https://site-1177969.mozfiles.com/files/1177969/ib_biology_textbook.pdfIn PDF document text
    • https://site-1177382.mozfiles.com/files/1177382/95725511164.pdfIn PDF document text
    • https://site-1235980.mozfiles.com/files/1235980/tutegezafewada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_5f9a01d3e18e5.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/7591424.pdfIn PDF document text
    • https://xurufujes.weebly.com/uploads/1/3/4/8/134864067/c665a9678.pdfIn PDF document text
    • https://site-1168020.mozfiles.com/files/1168020/49751286746.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://s3.amazonaws.com/votawawo/37016408849.pdfIn PDF document text
    • https://s3.amazonaws.com/wepeliniru/mount_saint_john_ohio.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/lagu_5sos_amnesia_uyeshare.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/woputanuluzatabijelije.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/lease_accounting_guide_asc_842.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 5076 bytes
SHA-256: be01aa81b55c69d3cd3590efdcd1cbc361eb62239f08a030d70f1e4f256d2e86
font_01_sfnt_off00013064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13064 12080 bytes
SHA-256: 6ae8c951be920ae25960373e6a3496d1e90040490655ff5fa68cd2e6724b9f4d
font_02_sfnt_off00015976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15976 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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