Malicious PDF — malware analysis report

Static analysis result for SHA-256 4306ac3116322b7b…

MALICIOUS

PDF

73.6 KB Created: 2021-02-12 15:16:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 59500d91919ec6d4612b24423fe40275 SHA-1: b256926147be48918201cd29d2eee296a7153107 SHA-256: 4306ac3116322b7b0cb38d2a69362aecc3ef2dbf7a13fae586069a8353e5171c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The 'ikea bed frame manual' in the document body and a URL likely serves as a pretext to direct users to malicious sites. The presence of ClamAV detection and ML classification further supports its malicious nature, indicating it's likely a phishing or malware distribution document.

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://baarspo.ru/wix?keyword=ikea+bed+frame+manual PDF link annotation
    • http://govnososal.xyz/arya_full_movie_telugu_hd_1080p2e8pe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478378/normal_60146b39a0472.pdfIn PDF document text
    • https://bojepelesu.weebly.com/uploads/1/3/5/3/135350442/xodoj.pdfIn PDF document text
    • https://valutakawewa.weebly.com/uploads/1/3/1/3/131378791/zozopiki.pdfIn PDF document text
    • http://abzac.me/623649315784qdsk.pdfIn PDF document text
    • http://klosheff.xyz/medefapefulumufedulybfe.pdfIn PDF document text
    • https://gurovepulebeguj.weebly.com/uploads/1/3/1/1/131163897/fefilaxeju.pdfIn PDF document text
    • https://cdn.sqhk.co/pevipulakas/cfidYQy/zozolekinafapizakivip.pdfIn PDF document text
    • http://buytoday.cc/xuwulupilenumowibotud7ss.pdfIn PDF document text
    • https://zusonugen.weebly.com/uploads/1/3/5/3/135305237/4962300.pdfIn PDF document text
    • https://wutotopuwa.weebly.com/uploads/1/3/4/4/134464713/zegosalo-mutezulu.pdfIn PDF document text
    • http://atomlinux.com/pearson_geometry_textbook_answers_page_153bkb6l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_601fcf969ef5f.pdfIn PDF document text
    • https://cdn.sqhk.co/gesafafo/Ugggi2A/lusazew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5fc7a03dc3956.pdfIn PDF document text
    • http://bottlechainworld.com/34298057135eihm6.pdfIn PDF document text
    • http://stepka2016.xyz/nudos_mentales_bernardo_stamateas_gratisayh8g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 5016 bytes
SHA-256: cd2f1a260b613418be1a06d4d38f97c4fc37b87e55eeb73cdfb50363ca666661
font_01_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 10064 bytes
SHA-256: b2d84eaea4010d852aa365fe4418aaac1ed5ba0e6bd6e6268b137635846b1f83

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