Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8f5c39cb8f1ec4…

MALICIOUS

PDF

73.3 KB Created: 2020-11-16 17:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1aa2ab8c16c81b8f1788c7a0b6c7a3ae SHA-1: d9b9e06329d72f24516ea0f5651e066a366729ff SHA-256: 5d8f5c39cb8f1ec44b7a55bb4896a0b2451945623d1ef1ce0f8a99f62d625750
234 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffmen.ru/aws?utm_term=biosecurity+fiji+forms In PDF document text
    • https://gasipepimajut.weebly.com/uploads/1/3/4/3/134367512/e7da239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5f9203c8d9a7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_5fa3bde6492cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_5fa8333cb013d.pdfIn PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/d794608.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/26b1d72f-ef28-4e56-884a-ce41f0c7b1a4/widoluwidetasoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e5294c8-7419-450b-ba8e-1db384524ef2/dabaruburusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f516a560-ae07-4416-a68f-e9072e815acb/sekuwopukosive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b441d077-1ff1-4139-ac88-8f6025879458/witukedexip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c0ebf32-cde1-417b-8730-e4ccfc5f51ec/the_triple_threat_of_fraud_involves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b448e4d-e3dd-4732-9f59-75257f17e18b/usmle_first_aid_2019_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2224ab53-7c77-419b-927f-7655ef72e633/cheap_flights_from_minneapolis_to_new_york.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb89bc8-7ea9-4354-92cc-31bf89764dc2/sift_heads_3_walkthrough.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_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 5012 bytes
SHA-256: 507420e4df8034f5b97e5382e537de0a8f049383061ed54cfeb17328079cb8a0
font_01_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 11056 bytes
SHA-256: c16764d3cd1743dc321b4087bd8e75bc39d83a79dcac54f4cefb6b1a50f66d21

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