Malicious PDF — malware analysis report

Static analysis result for SHA-256 368835cc503e78af…

MALICIOUS

PDF

72.2 KB Created: 2020-12-17 18:28:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ee8b8e5319751afa44786ceb362864ae SHA-1: 9682c7ec8fe090ff1edcab63be3dce8187acca09 SHA-256: 368835cc503e78af95b2ca8ac2edec8da68226a7ab4d840ca1870c6117f3372f
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to external PDFs hosted on disposable domains, indicating a link farm designed to distribute traffic or potentially lead users to malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as a phishing trojan. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/strik?utm_term=qdoba+catering+prices In PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/puburevedu-pulivepig-lidetejujaxiwig-rivogegekowesis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490539/normal_5fc9fb6a73d45.pdfIn PDF document text
    • https://gijogolip.weebly.com/uploads/1/3/4/7/134755622/serubuviroloxuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_5fba2bb29108d.pdfIn PDF document text
    • https://sekorora.weebly.com/uploads/1/3/4/8/134856449/sevasuwezuvoma_dadev_rubokoxoxute.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/3419276.pdfIn PDF document text
    • https://xiravitufe.weebly.com/uploads/1/3/4/4/134438949/4481702.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375698/normal_5fc666c22b06c.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/7382050.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413004/normal_5fc9797184911.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/satezogigi.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC162 5412 bytes
SHA-256: fadbc883f3e87a2e6612d04dfc40bfa8e4116115afa537edb9c1f5adaa6c110c
font_01_sfnt_off0000d3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BD 9732 bytes
SHA-256: 848c409a063c9247651dae0a9d522579d2c46b4c202845c91a58dc6140423897
font_02_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 10920 bytes
SHA-256: 12e79d20123dee076980654b68e6abd4ee7b2dcf093cd06d6f62d037f7ebbd52

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