Malicious PDF — malware analysis report

Static analysis result for SHA-256 940a5c024367f534…

MALICIOUS

PDF

67.9 KB Created: 2020-12-22 02:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7002b8fa548b4eafec40ebf99aba1da4 SHA-1: 91642737148c8ee4cf736ad75e5112a50f7d6bdc SHA-256: 940a5c024367f5346c4b6b1ee6c5f51ea64f75ad819fd362ff1aa777bd9dcc23
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO abuse tactic. One of the primary external links points to 'trafftec.ru', which is suspicious. ClamAV also detected this file as 'Pdf.Phishing.Trojan', further indicating malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=bitmoji+app+for+macbook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f88c6810fbc5.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/875387.pdfIn PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/7933771.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/miziniwodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aabc54c8-1635-4e51-8572-05092dd0a61a/jvc_kw_nx7000_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d4bf73-c224-4162-9fba-8bfcd766a0da/hawaiian_flower_tattoo_designs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/765003e6-cc77-43ea-96ef-d5526deb9020/tezudiriwub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e688e76-3422-4d65-ab5b-bdd7f3efe232/kowejoxiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/366dc232-1389-4e6d-a4d5-c5d0533519eb/fenukomijozimoruw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/750e2cb6-3b95-4b9e-b438-bbc7a0c0eb67/man_myth_and_magic_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2730bde1-6ec2-451e-a614-56335ebe3b90/62635949606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08aaa0b1-0b2d-441a-8e64-03d861a276f7/80518424714.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_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 5280 bytes
SHA-256: 2fd4c0a47260ae1f8ffbdf88d1e61578792ed14a573e011e3b19639f073e5569
font_01_sfnt_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 10896 bytes
SHA-256: a6cc2e71cf12b4a56e9c8e52b3cd27f6c3f2cac4731d70de5ed34624e550f665

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