Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a16a4a0e390a914…

MALICIOUS

PDF

70.0 KB Created: 2020-12-19 15:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f9b332faa9a48411efeb64b240a6943f SHA-1: 9092acd6b1411145419a7ca7dc69fb6d9ebe239d SHA-256: 1a16a4a0e390a914061dcd6d69f3125fade347265eb54a2c233520d29afdc234
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating it points to known malicious infrastructure. The document body, though heavily obfuscated, suggests a lure related to "cellular respiration lab answer key". The presence of multiple external PDF links, as flagged by PDF_SEO_LINK_FARM, further supports a phishing or redirection attack pattern. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/strik?utm_term=cellular+respiration+lab+answer+key In PDF document text
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/lumododip-nesar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387922/normal_5fcb961f367e0.pdfIn PDF document text
    • https://tibefuwejar.weebly.com/uploads/1/3/4/3/134332688/6908919.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467945/normal_5fddd287820d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/67c29ea0-b01d-4769-812b-6b6d2566d9e6/vemobolodirorav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2dcf159-154e-4e3c-812a-e4917a64969e/28564683873.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5adbcf9866f3fd2f48671/t/5fd18031b1f69267714e93d6/1607565362945/49759602459.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/linekigewurokidipuzari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5870c276-59ef-453b-930e-e4dd19b0fae5/77915452391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb564079-9819-4db4-95fb-14411be25f90/pobapikaruxomobenujis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8275dbb9-7c06-4128-baf0-2c6de6b22c60/41044296446.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/4886305412.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C7 5116 bytes
SHA-256: 846cd4ecfc1bd5db9cd0ff50a9d7e7a3a5c77a02960b38fa2dd1bee207ff27fb
font_01_sfnt_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 10828 bytes
SHA-256: b464a31ea22435eb905ee013649a6462bfb59b99287c8e6de06763c850ba97a4
font_02_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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