Malicious PDF — malware analysis report

Static analysis result for SHA-256 c358bba0cbc97431…

MALICIOUS

PDF

72.6 KB Created: 2020-12-23 00:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0e5389e612a946e3bbdee4b5fa544a1d SHA-1: 76bb5400acfc13f0b3cc9c1981753eb7ba2705c0 SHA-256: c358bba0cbc97431d474dbf6ea5e13bd57fbd454f4ce25c9e648a1978d3e7561
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to obscure malicious destinations or generate ad revenue. The primary URL, trafftec.ru, is likely part of this scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/123?utm_term=algebra+2+chapter+2+linear+equations+and+functions+answers PDF link annotation
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/nufazagenatino_zugitalogelefe_nijemadinufoki_xamezoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f8b21dcb9acb.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/66eeb43442f19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5f9194d27e3bf.pdfIn PDF document text
    • https://sivusemekatew.weebly.com/uploads/1/3/4/4/134491367/8576644.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/f5682c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484624/normal_5fdb1a02b03b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5f8983c76c38f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_5f9a6ad6322fb.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/a45dfc3b11e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5a5de085bf90c0e1d7acc/t/5fcbfea6eb18547f4b6f939e/1607204522055/happy_planet_valencia_orange_juice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858bafea-b911-4850-b20b-7fbb80ffda33/tagufewumado.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79b24f2297e36a9ff7b03/t/5fcae44633fb14715cb07733/1607132230707/directv_packages_cheapest.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
    • 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_off0000c29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29B 5896 bytes
SHA-256: 47614ee1e59d1f960553c764e08e248fa412557924207bacb472fbb815903471
font_01_sfnt_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 11360 bytes
SHA-256: cf5c1a50a31712f47705e8542f84ea2800f6e27d71b5d5e4d6cdeaa0f1c21b7b
font_02_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 16140 bytes
SHA-256: 5ef06bea0ce643391bea47400be2c481bde3ccceb1c2ec004e90928b1c9d5345

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