Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bc1d8656f84af6…

MALICIOUS

PDF

66.3 KB Created: 2020-11-22 21:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 50254afbab64dbbb16b1b0f98aed1ecc SHA-1: b3a7a499567726464987a262e92686e8d51f939f SHA-256: 39bc1d8656f84af6025381dbb8ab9d344ff9a1d4cc0d6493acc410a6266bdab7
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical detection for a link farm and a ML classifier indicating maliciousness. The presence of numerous external PDF links suggests an attempt to manipulate search engine results or distribute additional malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a phishing or SEO spam attack vector.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffine.ru/aws?utm_term=afrikaans+stories+for+grade+8+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5f951139559fe.pdfIn PDF document text
    • https://bikuxemigoveju.weebly.com/uploads/1/3/4/3/134373773/1cc24c32.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/2617136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5fa7bce0d3b06.pdfIn PDF document text
    • https://wenilitedosi.weebly.com/uploads/1/3/4/3/134315728/sesapazutamekibe.pdfIn PDF document text
    • https://zebamejiwan.weebly.com/uploads/1/3/4/3/134312785/babogon_xobivubedasim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5f8e80724cab3.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://s3.amazonaws.com/kavitokolezub/pidizugidapek.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/60677799971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b8c64c6-eebf-4b20-8a8a-9258df6809c2/dressmaker_ii_sewing_machine_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/captain_tsubasa_game_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fce9de6-d5c9-422f-a696-b2473ee64e79/50982916766.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/nuwasokiwobodevaviwun.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_off0000ba13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA13 5212 bytes
SHA-256: 4b9de216f73a2b3af0c16fe81c680466e36cb6237149056cabb648f1e8e65e0d
font_01_sfnt_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 10124 bytes
SHA-256: f6b70424caa17e0002e5fb454b521a5d5b3b1bd45452b51a925a8512fb0edb9e
font_02_sfnt_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

Open this report in the interactive analyzer, or submit your own file for analysis.