Malicious PDF — malware analysis report

Static analysis result for SHA-256 23db311d5485a397…

MALICIOUS

PDF

69.6 KB Created: 2020-11-18 22:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5a29a85f4ec69359cae18bfd1e178757 SHA-1: d757dd77c40e0ccffeb3aaf6c0cbc7ed074a84be SHA-256: 23db311d5485a397e02cabb8fcef708ac8a80f5351ccbb685e8a48466ff4b40e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, appears to be part of a lure to direct users to external URLs like 'https://traffking.ru/123?utm_term=hayward+pool+heater+installation+manual'. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • 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.
  • 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=hayward+pool+heater+installation+manual PDF link annotation
    • https://vukajikabazaxeg.weebly.com/uploads/1/3/4/7/134711597/1251357.pdfIn PDF document text
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/3951006.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/vufuxizirunozosodari.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/gexasijokeb.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/5136552.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/780194a5de4b.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/3587330.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/eaa38b19c.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/cb2660aa-effb-4d0b-9b36-ad5529648a89/27140488490.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/cuneiform_translation_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/951fa4b2-db9e-48e0-b839-ef41aafbc236/gozosawetuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0861717d-f55c-4b2f-a3fa-ee6b9cf16ea6/bijegiwivurilijunaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bebb44f2-67b1-4911-a776-a7f63b13ebdc/mechanicsburg_weather_17050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e96480a9-8427-46b8-b50c-5a9aeb16cdfd/41702725303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/533b34d5-95d2-413c-8a5a-82a2cd75f44e/luvenaworafaxi.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_off0000d3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A5 5356 bytes
SHA-256: 526e9198a4584cc0cc384f3471d9c2599ce2e0cb7a64c8dfb457ea36a00c4f95
font_01_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 10512 bytes
SHA-256: 66fcea3741932052fe93efe742f140ad0bc4e1325ae11fad7d61a71702def0da

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