Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ecdd8e5ed8d08d…

MALICIOUS

PDF

86.2 KB Created: 2021-03-20 08:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba9ca9de330b7c06d7f2e7b0eca5e269 SHA-1: 97b3e320872096247fc21c9338b5a2ddb6b5449b SHA-256: 10ecdd8e5ed8d08d93c67219aa10983df7c9f2a35e7779d0b43b27d36d748054
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, with one prominent URL pointing to 'pelibifir.ru', suggesting a link farm or phishing attempt. The document's content, though partially obfuscated, appears to be a lure related to bullying, likely intended to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=tipos+de+acoso+escolar+o+bullying+pdf
    • https://static.s123-cdn-static.com/uploads/4452587/normal_5fdcb6caf29e4.pdf
    • https://cdn-cms.f-static.net/uploads/4472484/normal_5fd1c00ee1c9a.pdf
    • https://cdn-cms.f-static.net/uploads/4452594/normal_6023f60ca7f88.pdf
    • https://static.s123-cdn-static.com/uploads/4409799/normal_5fef7f85e73e4.pdf
    • http://wedejopejujotu.iblogger.org/payroll_software_free_south_africa.pdf
    • http://monogawuw.iblogger.org/lobigijulesij.pdf
    • https://cdn-cms.f-static.net/uploads/4489596/normal_600de1fdb7aef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_42085d01d6fc422ab879603d9ddcdca5.pdf?index=true
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_5b82b48ba7d542089a62c938c6d8306c.pdf?index=true
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_86b45bef690d40459f741fc3acd33c39.pdf?index=true
    • http://toponetivipabar.rf.gd/74240889762.pdf
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_985239dd27874064b78f79c05a427d33.pdf?index=true
    • http://jejavonafire.epizy.com/answer_please_pickup_the_phone_ringtone.pdf
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_73942fda99854f208d8ee062751f800d.pdf?index=true
    • http://natadomemorad.epizy.com/asos_jeans_style_guide.pdf
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_8a55ab270f1849f984a6211148f5cc37.pdf?index=true
    • https://63209029-b609-4f89-80e5-af59b408cdb4.filesusr.com/ugd/0713e6_194ba9c69e364575a4fe5d717d11a83e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d9e.bin
d5705ab985b3b627a2fafbcbf6931f4feaaaf6b149c15386e3f1343929728ea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 5512 bytes
font_01_sfnt_off0001206c.bin
9339a08d21117a42dea42db528cce0f20ba2fd81f6fbe667b8c9bb2a101fa61f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 13292 bytes

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