Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03387fd5f81c2ff…

MALICIOUS

PDF

101.9 KB Created: 2021-01-19 19:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1d20dc4f749177a2380d9fc1ca24f167 SHA-1: 7d0c33427ccf5ee2ff388cb5db2505647a41b38c SHA-256: b03387fd5f81c2ff16fff422513f932d200d3f4bf3e9cbabba7b8d863de734db
126 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 as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/123?utm_term=what+does+mainstream+classroom+mean PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5fda55f0d5a3b.pdfIn PDF document text
    • https://site-1230941.mozfiles.com/files/1230941/pigenavelunuji.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/RLtginO/yu_gi_oh_duel_links_cheat_codes.pdfIn PDF document text
    • https://site-1178309.mozfiles.com/files/1178309/gunmaster_deluxe_universal_gun_cleaning_kit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453334/normal_6000f3e5da853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5f8a716402401.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488317/normal_5fc6f0cde8c8d.pdfIn PDF document text
    • https://cdn.sqhk.co/loxosefivipo/O3id3l2/52684804572.pdfIn PDF document text
    • https://site-1178471.mozfiles.com/files/1178471/kujetaxewumerexedij.pdfIn PDF document text
    • https://site-1218469.mozfiles.com/files/1218469/62292614890.pdfIn PDF document text
    • https://site-1207104.mozfiles.com/files/1207104/x_shot_max_attack_and_hurricane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_5fd7384c2abf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_5f9899e22201f.pdfIn PDF document text
    • https://cdn.sqhk.co/vefutifeves/QhiHSid/dog_balls_that_light_up.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/tijhchj/94417416587.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jenuvuzawo.epizy.com/accounts_receivable_process_flow.pdfIn PDF document text
    • http://wapudajikipidem.epizy.com/challa_song_djpunjab_uri.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/ethical_hacking_tutorial_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/handlettering_vorlagen_kostenlos.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/online_editor_freeware.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15034 5192 bytes
SHA-256: 66da278b166cd9616399c712529735f72ee6e7284262dcbde6fd9b2e132ebdf4
font_01_sfnt_off000161bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161BC 11212 bytes
SHA-256: 8f1ee473729f4b8cdca97b1ccaf3275a1f7880fe3c4c8d0e2a4f3491757c9bd7

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