Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced936c69c0a838e…

MALICIOUS

PDF

80.6 KB Created: 2021-01-16 21:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3768b285fe3bdac90d2a566854429b14 SHA-1: 5414926de85d5c0bd8db4491fff93fc1f73dc933 SHA-256: ced936c69c0a838eefe84d2cec6c30bda83d69f8430b5d62a8025317e8a6661c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic firing indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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
  • 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.
  • 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://traffking.ru/wb?keyword=jibjab%20alternatives%20free In PDF document text
    • https://cdn.sqhk.co/lopumilekana/6vhjnjb/1046131167.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463002/normal_5ff32ac292568.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373779/normal_5feb68ed311ba.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/bQhbUhf/18977583194.pdfIn PDF document text
    • https://ruwitopiramowu.weebly.com/uploads/1/3/4/3/134364975/nuduposanovuv.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/wunugu.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/jasadavebaga/33764720435.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/mupifuvakitadukulom.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/xerikesosezipegirexometus.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/12311777783.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/cpr_new_guidelines_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/abatec_informatik_gmbh.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/bodoni_72_oldstyle_book_font.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/30964827015.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/how_many_meters_is_a_track_in_america.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_off00010218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 5028 bytes
SHA-256: d26b0e96328ae9494385ac560aa013878aed7721f6ea662157ed3f547ef04147
font_01_sfnt_off00011351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 10092 bytes
SHA-256: 2469f00632e8ce2a6ec1ed0e55753c4d71820d7cd8514dff3db67ef781c19868

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