Malicious PDF — malware analysis report

Static analysis result for SHA-256 597ecc3dbc30076a…

MALICIOUS

PDF

83.5 KB Created: 2021-03-11 14:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 92d9ffe8cccb98820cff0358a7272827 SHA-1: 8427de8c01b37210898f6485d0f776a99ca42179 SHA-256: 597ecc3dbc30076a56511b48f94e1a8868fe69110a0da6ee9ca7e682b8c6aca8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating it is part of a link farm designed to drive traffic to various sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO spam. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=how+to+print+photos+on+my+hp+envy+4500 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385647/normal_5ff179a819dba.pdfIn PDF document text
    • http://nyvelsets.online/top_bar_swarm_trap_plansc7lng.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449193/normal_6040be89d3a03.pdfIn PDF document text
    • http://milanomoda.site/football_index_excel_spreadsheet657fz.pdfIn PDF document text
    • https://bujipivew.weebly.com/uploads/1/3/4/1/134131373/lamepokiwojajozok.pdfIn PDF document text
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/17270.pdfIn PDF document text
    • https://jaragamonobuwuf.weebly.com/uploads/1/3/5/3/135346236/5093426.pdfIn PDF document text
    • http://koprovk.xyz/tapisolp6jeh.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/how_much_does_it_cost_to_run_a_gas_wall_heater.pdfIn PDF document text
    • https://zapedumukovig.weebly.com/uploads/1/3/0/7/130775012/farosugijaxigu.pdfIn PDF document text
    • http://spiritstudio.ru/eso_crafting_leveling_guide_2018zzjkb.pdfIn PDF document text
    • https://sobolone.weebly.com/uploads/1/3/0/7/130775045/pewujotugotijabuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_604153c86dc1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_1b41348df60b4e1b9bbc94a55a1c95ce.pdf?index=trueIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_575410894fea43819508fd8864c2690e.pdf?index=trueIn PDF document text
    • http://donijexufenu.onlinewebshop.net/what_size_suitcase_is_good_for_carry_on.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/scert_haryana_books.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_2b8a7ceed7ce4ef7b1deb5ccc1368008.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/8276424247.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/goetia_game_guide.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_off000109c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 5384 bytes
SHA-256: 4530f1c94f723881c5fe313dd7a14fd7de82792196420cebc19531b03e46d332
font_01_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 10748 bytes
SHA-256: 453d4296b5e563dad4506de5b315f4295d5feac921acb2d1e44e1c3242db5f4f

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