Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7142b0b3588ce5b…

MALICIOUS

PDF

73.0 KB Created: 2021-03-07 18:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d1f02dea41a14d3158854cd9d556492f SHA-1: de396383d5a2e9d3303a801741b79e4e3126679f SHA-256: a7142b0b3588ce5bf13bf73abcd39add49d7683a6571d8f428e0c334122ff664
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable domains and link farms, suggesting a SEO poisoning or phishing campaign. The embedded document body text, though garbled, includes a search query, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/wix?keyword=fort+lauderdale+high+school+mascot PDF link annotation
    • https://cdn.sqhk.co/penuvipaw/giibgjQ/75992228596.pdfIn PDF document text
    • https://cdn.sqhk.co/dumotometapo/ihgehaB/weighted_jump_rope_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/rozamulev/hsif7ih/120923167.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/if8iajj/rekej.pdfIn PDF document text
    • https://cdn.sqhk.co/nogegamapagi/iehfKct/iron_punch_game.pdfIn PDF document text
    • http://lupaper.22web.org/gojetotin.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/cjdGgiF/24023981739.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/RgchijX/pixel_combat_zombie_strike_unlimited_money_apk.pdfIn PDF document text
    • http://gokojemisivuf.22web.org/lolul.pdfIn PDF document text
    • https://nafeziwubiwodi.weebly.com/uploads/1/3/1/3/131379183/1128135.pdfIn PDF document text
    • https://karinavoru.weebly.com/uploads/1/3/4/0/134017817/dugezazudadiwa-karojafo.pdfIn PDF document text
    • http://guwelozi.iblogger.org/demaseroxanoz.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/323b7c4f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baxosadukosi.rf.gd/sanuletalupinefobiwu.pdfIn PDF document text
    • http://viladanus.epizy.com/videoder_app_for_windows_7_ultimate.pdfIn PDF document text
    • http://sulunaza.epizy.com/calmodulin_isoforms_in_plants.pdfIn PDF document text
    • http://vagawujososoje.epizy.com/how_do_you_make_simple_syrup_at_home.pdfIn PDF document text
    • http://veduredetud.epizy.com/54296317229.pdfIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_c1296a63d647404694fd7b50177986ea.pdf?index=trueIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_d179525b33394eb3b16b66d07a208a36.pdf?index=trueIn 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_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 5308 bytes
SHA-256: 1897b508ded4e3c737291709cfdc6e9c568f64362627c4aca6d5831417d7b401
font_01_sfnt_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 10528 bytes
SHA-256: 8c542f576aed81ae27cf11f1ccf318f375c76ab34191719e0ec98b12ec47d615

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