Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c524dae5716681…

MALICIOUS

PDF

67.7 KB Created: 2020-11-18 12:12:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1c0b8e7221b5eaf6ac013dd1d8d5c3b8 SHA-1: cd6040b56f0a13a0a7f0787c9cfc9ed2292f1940 SHA-256: 67c524dae57166814ccb3e55e43b1e3880ca721f6f4cb9a5e69cf9a9924565bd
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

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/123?utm_term=calculus+of+variations+gelfand In PDF document text
    • https://cdn-cms.f-static.net/uploads/4484995/normal_5fb25c35f25aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5f8bafacab7e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_5f91d64f682a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456705/normal_5fa672b125ab9.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/9be023b1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_5f9256a14b85f.pdfIn PDF document text
    • https://kudojazejugir.weebly.com/uploads/1/3/4/3/134322101/1809775.pdfIn PDF document text
    • https://fekalebewobazo.weebly.com/uploads/1/3/4/6/134668576/befelexokiniworesuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f9b17202e783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460058/normal_5fa7349c264fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec4541a-0d09-4309-b064-d27d0d06c224/pikokumelufagoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e192746-46c4-46e8-aaf0-726164c7cf5f/dufiju.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/identifying_figurative_language_in_song_lyrics_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sezutuma/kazubakijokad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90ee1baa-4224-4898-9df3-74716e780e6e/dfw_knight_porn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6072b212-1610-48ae-bf2e-98cf0c583758/rexujuwumipurevu.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_off0000ce16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE16 5156 bytes
SHA-256: 094e23ece50f869fda580206e7afad9263391074dd1ae3335563541e9fddfeab
font_01_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 10016 bytes
SHA-256: cc3c5acde5cde1de4aaf8cb1fe2ba56152a2d7dfd765a4e0e3a91e111419a51b

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