Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7e3d6d763ceca1…

MALICIOUS

PDF

62.9 KB Created: 2021-01-11 09:31:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9c97c74023b4607cdfc23910c5a8b998 SHA-1: 29661e40ee9126cb0479b5043bdd088e94999551 SHA-256: 7e7e3d6d763ceca13c75be1bf9b9675e83a054a82a425e157c99459fd98f37f9
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also assigned a high probability of maliciousness. The embedded URLs suggest an attempt to direct users to potentially harmful content, possibly for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://traffmen.ru/123?utm_term=dog+collars+etsy+uk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_5f9118d7576a7.pdfIn PDF document text
    • https://site-1177340.mozfiles.com/files/1177340/begiwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389601/normal_5f909d354b7f8.pdfIn PDF document text
    • https://faromemexe.weebly.com/uploads/1/3/5/3/135399009/xonizaf.pdfIn PDF document text
    • https://site-1176903.mozfiles.com/files/1176903/mad_truck_racing_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_5fa69c993e1c7.pdfIn PDF document text
    • https://site-1172455.mozfiles.com/files/1172455/tegesikot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387050/normal_5ff49f1f55abc.pdfIn PDF document text
    • https://site-1196452.mozfiles.com/files/1196452/ringtone_for_iphone_apple_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_5fd9dd150066b.pdfIn PDF document text
    • https://duwifugikez.weebly.com/uploads/1/3/5/3/135351140/tamuzeda.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/idhezuv/60864982337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD24 5132 bytes
SHA-256: 4306122f6b4021279ac13a3fbc342b9bb21b7580689a7433538d7f09726eeb65
font_01_sfnt_off0000cec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 9416 bytes
SHA-256: 9781db0427395f143c5b139fdb1dbe9ce731c1baaf5a20cdb379edb9461006ff

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