Malicious PDF — malware analysis report

Static analysis result for SHA-256 057fe29c8c6eb331…

MALICIOUS

PDF

68.0 KB Created: 2020-11-27 23:15:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 412d2966f771e8cbe5bc3af1d18d1bf9 SHA-1: 902cfaba6f9087a3c9c7a88e9759478054b4dd59 SHA-256: 057fe29c8c6eb3319761648c08307923f500dfb3bcb761caa4069504812ca60f
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://traffnew.ru/strik?utm_term=hughes+hallett+applied+calculus+pdf PDF link annotation
    • https://zasisenixe.weebly.com/uploads/1/3/4/6/134632294/9849524.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/xijifunoxerupirukilo.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/9506eb3ef.pdfIn PDF document text
    • https://muxekedov.weebly.com/uploads/1/3/4/7/134706321/4771970.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/17cd4038253e8.pdfIn PDF document text
    • https://vimadefivikimaw.weebly.com/uploads/1/3/4/2/134265378/dusomaroga_zapefojokomoful_ratuwazab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450501/normal_5faf5a6514e5d.pdfIn PDF document text
    • https://lunixomowomok.weebly.com/uploads/1/3/4/8/134859132/dogukipaveraw.pdfIn PDF document text
    • https://rusopuse.weebly.com/uploads/1/3/4/4/134498446/gisata.pdfIn PDF document text
    • https://pudisipilusive.weebly.com/uploads/1/3/4/5/134597375/fanuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5f95fbcfbe33a.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/cc242a06-bd5c-437b-9ede-de75ceff49ef/113204225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644f6f23-b003-4371-aa3a-5c59beae3837/taxawakavatavibolifonure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd01b8e-77e1-4766-846c-b6cfbc68b8c6/vupizikorusir.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_off0000cb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB28 5280 bytes
SHA-256: 9a64f98a5c2649da7edcb0e0c29c2e8f8da2fb442ef720bac710b2616301d2c4
font_01_sfnt_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 10736 bytes
SHA-256: 56844e3700deb30abf63ca2f0957f4d3739b9db323b922a72aebbe92cf33eaa8

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