Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9f4576b04e2eb4…

MALICIOUS

PDF

76.8 KB Created: 2021-02-10 14:48:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 388ff720d0976811136d3ddf465dac84 SHA-1: 2e0fd4c0ec3ba5b6869b289bffcf894f7a981ff2 SHA-256: ff9f4576b04e2eb4cf19e64e9a1c6969188e6bd1c1fec41480258d033ba06616
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting or known redirector infrastructure. The primary URL identified, 'https://crophysi.ru/wb?keyword=aziz%20ansari%20book%20modern%20romance%20pdf', suggests a lure to download content, likely leading to a phishing or malware distribution site. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution campaign.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=aziz%20ansari%20book%20modern%20romance%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5fe713f197f11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_5fd750ab4e920.pdfIn PDF document text
    • https://revelamedif.weebly.com/uploads/1/3/1/4/131437508/220538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_6020722082e11.pdfIn PDF document text
    • http://nickned.me/potufadosafajemubjvicl.pdfIn PDF document text
    • http://podarokinsta.site/29344280387rw0ql.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458389/normal_5fdc601e6b594.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415309/normal_5ff09d5cc2fcb.pdfIn PDF document text
    • http://my-favshoph.online/tasepewataruros7typx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392868/normal_5ff3b298523e5.pdfIn PDF document text
    • https://nejuxudukekiti.weebly.com/uploads/1/3/0/8/130874136/kodupubiku-fizukirubuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412151/normal_6015ffdb1fbba.pdfIn PDF document text
    • https://samivixawudajan.weebly.com/uploads/1/3/4/6/134634686/2285597.pdfIn PDF document text
    • https://cdn.sqhk.co/lodesejidi/hhhj3ic/bajikeregekilokane.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_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 5512 bytes
SHA-256: 051c871d1212af48e1480aa531a0c5f219a366683d805104a332802fc32fcc16
font_01_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 10932 bytes
SHA-256: 7f53b40dc138520fa41986baad316b4abb8091a6d29bf2bcb6a2f25cbbecb790

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