Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec68827b1af597a…

MALICIOUS

PDF

81.0 KB Created: 2020-12-29 11:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1dd8fae2afe80a9e1d48d17c5ab80f94 SHA-1: 1ee98d615a1b659cb19c507da10eb90a2bf3909d SHA-256: dec68827b1af597a3bee03427295f13fe8a325a4c27fe7cbd0372453179cd8b5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffset.ru/123?utm_term=spacemacs+clojure+cheat+sheet PDF link annotation
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/015f626.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/c7868ba971359.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/9756451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_5f94795f681c9.pdfIn PDF document text
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/piwuni-pekokupe-waxibajel.pdfIn PDF document text
    • https://muvisodujop.weebly.com/uploads/1/3/4/3/134358588/cb4437e65033.pdfIn PDF document text
    • https://mubopizolofovo.weebly.com/uploads/1/3/4/4/134442803/joziboxazi-nasobisumamuva.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/27697fbb-da62-4ca9-84a0-ab86037288db/lopuwezedobufanup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b238d7f6-8ff5-4d5f-8173-52e3808767fb/34738542941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a478a70-f0c4-4120-bb95-2e9a1e65e45f/stoichiometry_practice_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/skylander_ring_of_heroes_rune_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c003ef9-112a-4665-8d19-0abe9ecd6242/kokovugifurukerisesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07cd8583-90aa-499d-8394-af93215291b8/sedasininiterutumile.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_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 3396 bytes
SHA-256: 8570700e2052b5cf50d6e722bcd6b086feb1b31f4f14fa85b5be620d2c822dd7
font_01_sfnt_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 5352 bytes
SHA-256: 5b1e94b753c24d926c8087a060aa728a84ef5681aaa757cad7ccdef8cb39f64a
font_02_sfnt_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 11824 bytes
SHA-256: 9f736ef292f47cab1d30f7b156fe516eb79aa29f1b56334838a76ba184302678

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