Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd38e4778fdd3b0a…

MALICIOUS

PDF

75.5 KB Created: 2021-01-06 21:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f0ef21e58ea9b6b99b6a16d6cf9b8e91 SHA-1: 744da4c8fc8040ec2d7ac08d2196526e60c317a1 SHA-256: cd38e4778fdd3b0afafbbc758aa1f24a9e9433d929820faaaec4349788976288
214 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to external PDF files hosted on various platforms. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://cctraff.ru/aws?utm_term=sample+email+asking+for+informational+interview`. The presence of a link farm and the redirection to a known malicious URL strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://cctraff.ru/aws?utm_term=sample+email+asking+for+informational+interview In PDF document text
    • https://sivevaredewiw.weebly.com/uploads/1/3/4/4/134464028/2156013.pdfIn PDF document text
    • https://rezojitelato.weebly.com/uploads/1/3/4/6/134649293/6301449.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411931/normal_5fe59684d61ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456671/normal_5fe2520390d17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451762/normal_5fc3bec9d7866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413583/normal_5fa5e7ce78a46.pdfIn PDF document text
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/parowizurofu-fariwadi-dowusorusebewit-duvumekutikowaf.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/febovowepufim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447915/normal_5fba6bd84c30a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378155/normal_5fcd01b9b6318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5fe7471f1d1ed.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/ladojenefe/20836633463.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/fuguromilixadop.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_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 5540 bytes
SHA-256: 92cf30515e5c341e7de2bd78cb7bdd09517bfc7f5e377d573c8c710b1710ae44
font_01_sfnt_off0000fd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD63 10396 bytes
SHA-256: c4b057bb6e0c17a773acb598992b1fcc8f6ca026419e92450597c5a24c524b50

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