Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27f6715cef18c96…

MALICIOUS

PDF

89.4 KB Created: 2021-03-20 07:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a4a5c383f4d484872f8cd3b7d6995f1 SHA-1: dc34bfef92d8882c7ba271e9606d1b78ccdf45dd SHA-256: d27f6715cef18c96da7a0494c94a968feeea83289ec559bf1cfbdafab8d26f1d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing campaign. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were extracted, the structure and numerous URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=class+paul+fussell
    • http://shtangelkipokupkiitd.online/74055602604us5kd.pdf
    • https://bidemujoniju.weebly.com/uploads/1/3/1/8/131856381/rojosazum.pdf
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/bd52e.pdf
    • https://nasoluludeg.weebly.com/uploads/1/3/4/4/134435301/6783ed1c264.pdf
    • https://gexuxufe.weebly.com/uploads/1/3/1/4/131406387/gesilivi.pdf
    • https://cdn.sqhk.co/wejafivelij/hfnztgi/katyusha_rocket_sound.pdf
    • http://2gusevshop.space/wiruvugaminegavote78hlq.pdf
    • https://cdn-cms.f-static.net/uploads/4456985/normal_604ffd1e511df.pdf
    • http://1xbet-registrat.site/wolulawexisakbsmr.pdf
    • https://cdn.sqhk.co/zonakagud/cSXUI9N/37681486450.pdf
    • https://widajuzuno.weebly.com/uploads/1/3/1/6/131637349/3317620.pdf
    • https://static.s123-cdn-static.com/uploads/4384628/normal_600688aeb3fe0.pdf
    • https://cdn-cms.f-static.net/uploads/4481510/normal_5fd7c6ab7e3e9.pdf
    • https://cdn-cms.f-static.net/uploads/4451377/normal_6023ff0619be4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_eaa0e10fbcdf447092999a22e97b9f7d.pdf?index=true
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_209fd262c9f846b6be814af1e501d57b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bdb0c35b-a0d7-49cd-8d5a-4511db9bc3a1/vawuvevojepatuviperixukaw.pdf
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_4db0eab943454bf19a101f51e81e0245.pdf?index=true
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_36a5b732c5b64e7cb3c7afa582fa93e1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d52ed429-64a1-4bc3-896b-5e73b6b92c7f/49167788363.pdf
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_5b4914c70533472ebd16bb8b6003dbce.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_off000123a4.bin
cb5421917e619f866bdac2e082eae7df9fbd500d084e7a03a2c322bf0f90de42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123A4 4704 bytes
font_01_sfnt_off000133b5.bin
d6ee639874614841efe5b2a025d86821dace1f306d37ee8b7ab048627a39a2e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133B5 10412 bytes

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