Malicious PDF — malware analysis report

Static analysis result for SHA-256 39090b4eb40c2fcd…

MALICIOUS

PDF

73.8 KB Created: 2021-01-16 05:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e8906e7bf23323d1218876a70c6e8aaa SHA-1: 6b475de6b45d8d312d7451bba28a72566028c897 SHA-256: 39090b4eb40c2fcda073c63600a860594bc5ccf013f17762b2c97e6371207cea
126 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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting services and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to drive traffic to these sites. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest the PDF is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffking.ru/123?utm_term=ohm%2527s+law+worksheet+regents+physics+answer+key PDF link annotation
    • https://site-1199448.mozfiles.com/files/1199448/78285577989.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420747/normal_5fecf1fc0c8d3.pdfIn PDF document text
    • https://site-1199467.mozfiles.com/files/1199467/biziferu.pdfIn PDF document text
    • https://site-1177219.mozfiles.com/files/1177219/silanukexe.pdfIn PDF document text
    • https://doxeduzawixufak.weebly.com/uploads/1/3/4/3/134383044/6825ba26.pdfIn PDF document text
    • https://site-1168414.mozfiles.com/files/1168414/pupajasobid.pdfIn PDF document text
    • https://cdn.sqhk.co/tadawatimi/gggTja5/78416237333.pdfIn PDF document text
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/puwojesunevusuj.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/869a6a.pdfIn PDF document text
    • https://tefovaxosu.weebly.com/uploads/1/3/1/1/131163863/7cfb4193d8e34.pdfIn PDF document text
    • https://cdn.sqhk.co/mewedenemez/ZgegRic/tower_builder_1._20._3.pdfIn PDF document text
    • https://site-1242625.mozfiles.com/files/1242625/body_hate_hollywood_movie.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB56 5664 bytes
SHA-256: d65080094af3e591028910d120e79a9f45d90f437dc9c817861789eb0a7834a6
font_01_sfnt_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 10692 bytes
SHA-256: d155fa740b7045a2e16e97ca9e2be33e4d621dfbf21c75e1ce1e39d6b79667ae
font_02_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 16076 bytes
SHA-256: d4a88a3a8205faafa880075823aabd831252e3f8020b7d06daf30e92536d8b86

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