Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d62d7b3ad104491…

MALICIOUS

PDF

76.9 KB Created: 2021-02-21 19:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00c7c5e43f4043f226d39816e6448915 SHA-1: 520dc8be8e6614dfd72d9c60fd79e5fd128e8406 SHA-256: 1d62d7b3ad104491f92639400d53e620158ccfc471db3a69d5bf3f7f0b722d3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs point to various PDF files, some of which are hosted on suspicious domains like weebly.com and epizy.com.

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-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://seumenha.ru/wix?keyword=nord+electro+3+seventy+three+manual
    • https://sofofiwolasaxu.weebly.com/uploads/1/3/1/8/131856039/gesapifilo.pdf
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/54c5d48daf1790.pdf
    • https://cdn.sqhk.co/tegatiwuwax/hghegiS/melitobulirafof.pdf
    • https://cdn.sqhk.co/pimidima/VjRBU6S/74522019062.pdf
    • https://cdn.sqhk.co/vabalogu/wpllMid/farming_usa_2_free_download.pdf
    • http://jaraxusej.iblogger.org/nivowidofurotisone.pdf
    • https://cdn.sqhk.co/jarogofef/hcFBQhc/xuvoduxif.pdf
    • http://trydouche.xyz/airtel_volte_settingswbnda.pdf
    • https://cdn.sqhk.co/rurewemanavi/GjjDGtb/36400948238.pdf
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/kadisekafelowapoj.pdf
    • https://cdn.sqhk.co/kifuzopeko/gcgj2gf/apache_attack_helicopter_shoot_to_thrill.pdf
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/nevinaluxid_pogedef_rugugigi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xofafatererowu.rf.gd/double_bed_sheet_for_king_size_bed.pdf
    • http://tenurusimuxu.epizy.com/allcast_receiver_for_pc.pdf
    • http://petekukeseji.rf.gd/day_of_the_dead_matching_worksheet_answers.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_off0000f0cf.bin
b1736fde71c6be75df41527321a193e6290b7b9d3ef37ff5d1261d0f8fbda40c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 5472 bytes
font_01_sfnt_off0001034b.bin
6a68c931072dd969e18518c25ed1e6fa493d1cf1a2115e04e00bb0cb74a01c32
pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 10408 bytes