Malicious PDF — malware analysis report

Static analysis result for SHA-256 155c5c9298fd3a5f…

MALICIOUS

PDF

110.7 KB Created: 2021-03-04 14:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e84cba4f16a3b820fb13e1c02c289cb2 SHA-1: c6fd4400cbe447817bf5cfac7f3a6a4937087b67 SHA-256: 155c5c9298fd3a5f2ae59a432cd2584946bb2da0142432c7d33145f955493ca5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=meditations+on+first+philosophy+explained PDF link annotation
    • http://nuvuxek.iblogger.org/93237402780.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476268/normal_6007e3ee476e5.pdfIn PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/67e7339.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/6874879.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456132/normal_5fce8c7807c34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492586/normal_60395e2682233.pdfIn PDF document text
    • http://mananeje.66ghz.com/adobe_flash_player_chrome_11.pdfIn PDF document text
    • http://kipoxepufe.iblogger.org/lamborghini_aventador_spyder_price_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wewimolu.epizy.com/75820285367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/668017bb-73e3-420c-920f-2893c7e2c9d4/34362914387.pdfIn PDF document text
    • http://resipivoxopir.rf.gd/the_shining_twins_dolls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca291da-99f8-46a1-ba5b-b8bce9f0c666/14922347053.pdfIn PDF document text
    • http://xutevefe.epizy.com/saxeropu.pdfIn PDF document text
    • http://lilepav.rf.gd/41505980601.pdfIn PDF document text
    • http://kewewebur.epizy.com/degupodeburomebezonuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20be7190-447e-4ce6-85f1-f16505cb6e18/how_to_remove_totaline_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95317728-fa14-4748-8920-0c1830529e57/descargar_los_juegos_del_hambre_saga_espaol_latino_mega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5e5f4e-79d1-42b9-8f65-3e9acfa155ea/41613946030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e206767-c994-47a8-af47-218ffb95d5bc/zetuzilizezoladu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bcf26ff-0d75-4f3a-a3a6-af4546fca454/html_basic_tags_in_hindi.pdfIn PDF document text
    • http://nisuzadusidu.epizy.com/benexutazixirifotad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e15afa-25ce-44ab-9052-a987e79b8099/will_star_wars_have_another_trilogy.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_off000173c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173C5 5304 bytes
SHA-256: 18d2b11a1c517b9dd0d95e9e1835802d6edc0cc6d5afe070c72ffbba519f50db
font_01_sfnt_off000185e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185E4 11952 bytes
SHA-256: db5149ef9dff2d463390e5ede0b0df55ec5ba5b88a209ba82a28752472d7ca61

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