Malicious PDF — malware analysis report

Static analysis result for SHA-256 914c7ae6a64cc6a8…

MALICIOUS

PDF

74.9 KB Created: 2021-02-25 13:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 27e7bcc91dc4ad4ea3ddcfdce41ec043 SHA-1: 18f051092d1a6aa7c2292bb4fa1be66f53c3cf9c SHA-256: 914c7ae6a64cc6a8b6e7e2ba8b5755f79af4539481e80a131c86978a32a91d5c
242 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files hosted on various domains, many of which appear to be disposable or used for link farming. One critical heuristic indicates a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, likely for SEO manipulation or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8905

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/award?keyword=what+was+absolutism+in+europe In PDF document text
    • http://paselon.getenjoyment.net/rukisabisisobonemolokiza.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/garozivozobede-mukogizokapurok-pomunezobuzaji-moxesu.pdfIn PDF document text
    • https://wobereresexo.weebly.com/uploads/1/3/1/6/131606335/kebekifumeze-kibaxagabaxi-wanibuj.pdfIn PDF document text
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/ab092b0.pdfIn PDF document text
    • https://karivimefoga.weebly.com/uploads/1/3/4/3/134311068/juvaxetivu.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/94626778090.pdfIn PDF document text
    • http://desokore.medianewsonline.com/probability_problems_with_answers.pdfIn PDF document text
    • https://gaditefu.weebly.com/uploads/1/3/2/7/132712385/4724396.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/topezuxazazulurojarize.pdfIn PDF document text
    • https://sazomoravevak.weebly.com/uploads/1/3/0/9/130969829/runujafen.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/70275740140.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jezevenakos.myartsonline.com/mexaponiwikapubabu.pdfIn PDF document text
    • http://pujumek.myartsonline.com/is_breath_of_snow_and_ashes.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 5304 bytes
SHA-256: 1f6611cd64174b4dc77d03eded96339ff3500cf92c64b2ae2d7d9e78d3a70582

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