Malicious PDF — malware analysis report

Static analysis result for SHA-256 60c37f3c8ab37566…

MALICIOUS

PDF

80.1 KB Created: 2021-04-05 03:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 543f4a763ec386f04224bc95d6775192 SHA-1: 56ddac0b350d434cdb7ee4051f6be75b8be1ce66 SHA-256: 60c37f3c8ab37566333e2f5dff84888e2a1c5070e49d69d3c1e07bff85d4f6fb
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm designed to attract traffic. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm the malicious nature, pointing towards a phishing or trojan distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://druttle.ru/award?keyword=balconista+de+farmacia+senac+pdf
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/ddf0c0.pdf
    • https://cdn.sqhk.co/tusenepobam/jbItaji/blue_ghost_rider_wallpaper_cave.pdf
    • https://cdn.sqhk.co/zubavagi/vjahgje/munefudoxetogevozez.pdf
    • https://cdn.sqhk.co/kifukuvitog/lgiuQih/kewoserejodukofovel.pdf
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/2ec8ca3f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_7244e682cc924d4cad4a153333be9abf.pdf?index=true
    • https://s3.amazonaws.com/nademopor/33555291603.pdf
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_edf2a9a357a443c4a0ef6fb11d332b9b.pdf?index=true
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_e50fdc207c814ff7b0a321e28bf838be.pdf?index=true
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_89b2f41c94ac4b2c87eed5aa114012b5.pdf?index=true
    • https://s3.amazonaws.com/gezetega/15485181208.pdf
    • https://s3.amazonaws.com/bidivo/tumolojegazuxuguduba.pdf
    • https://s3.amazonaws.com/liwafo/word_that_doesnt_belong_to_the_20th_century_music.pdf
    • https://s3.amazonaws.com/zoromexemuzid/41888274003.pdf
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_6f4909a216e04997b326bd4667f3dead.pdf?index=true
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_b04815fa594649c085f4c53a626ddff6.pdf?index=true
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_7c7a0eac865d4e358ba9d51b28ead123.pdf?index=true
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_24d21fb3caaf4caba83e8275acd5fa9a.pdf?index=true
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_eddd813739e44d899c62cef27fe4b1d0.pdf?index=true
    • https://s3.amazonaws.com/wulotugadag/the_whipping_boy_book_read_online.pdf
    • 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_off0000f774.bin
1385060c59e04e8ade61f5e9c482d35e46ccd51d0258f3568488ad49dcd2b94d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 5348 bytes
font_01_sfnt_off00010989.bin
a9998a69607b73dd5fb0e0d790d22bf5d58427f59725c5ea5687e38e676ed2ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 13088 bytes

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