Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f4d5c700eea73a…

MALICIOUS

PDF

72.2 KB Created: 2021-01-11 17:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4f60883cb293adb2403b453d2f225107 SHA-1: 002451299fbc0faa415aa58c02c154ab0e94efba SHA-256: 12f4d5c700eea73aa543c5d18891930b55a4ad4b20ddc4244fafdc9298f22f6d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm. One of these links, https://cctraff.ru/aws?utm_term=mejores+aplicaciones+android+tv, is flagged as malicious. The ML classifier and ClamAV also strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the link farm suggest an attempt to redirect users to malicious or spam content, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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=mejores+aplicaciones+android+tv In PDF document text
    • https://tofejigijo.weebly.com/uploads/1/3/4/3/134312142/sunobijadim.pdfIn PDF document text
    • https://site-1172011.mozfiles.com/files/1172011/85900449458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_5fad783218bcb.pdfIn PDF document text
    • https://site-1175420.mozfiles.com/files/1175420/muguvexevomakotikalivan.pdfIn PDF document text
    • https://site-1177129.mozfiles.com/files/1177129/48927972919.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403276/normal_5fee0197e6c50.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/977431.pdfIn PDF document text
    • https://site-1168059.mozfiles.com/files/1168059/gimopiwutuvejifejaramew.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/votawawo/29022027248.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/45948815685.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/epp_foam_sheets_lowes.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/criminal_case_game_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/12677841432.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/99528249961.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/17177049874.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 5208 bytes
SHA-256: 0793b9b3aef17c566cdc8b2622d3760afa276a7808a4a3cea16e01ce1c044a20
font_01_sfnt_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 10860 bytes
SHA-256: f9bddda5ceb54a259e82a0f26b3b217b9cec5a86af8b6eb2e14218b16af91803

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