Malicious PDF — malware analysis report

Static analysis result for SHA-256 870e85d7f1e73437…

MALICIOUS

PDF

73.1 KB Created: 2021-05-31 19:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aa67335fd23a5e8180f6016d12489269 SHA-1: f48ca36e1f47568287bd56004a16a1afe6236329 SHA-256: 870e85d7f1e734379dc7b368c40ef5b1401ee28a55784ed8a2d339a1026b09ba
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 services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/pbw?utm_term=can+i+get+directv+app+on+my+samsung+smart+tv PDF link annotation
    • https://dakubazelup.weebly.com/uploads/1/3/1/4/131454222/8825141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_6040ad8731d04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475719/normal_601de40a71eb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404980/normal_60522b81adb59.pdfIn PDF document text
    • https://boluduviwusasuv.weebly.com/uploads/1/3/4/4/134458391/7851121.pdfIn PDF document text
    • https://vusuvokitajize.weebly.com/uploads/1/3/0/8/130874031/sefive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_603ac20fad6ff.pdfIn PDF document text
    • https://zoxogonufi.weebly.com/uploads/1/3/4/9/134900606/c8896ec34.pdfIn PDF document text
    • https://sudewivevumofe.weebly.com/uploads/1/3/4/0/134042571/c1e5a86ccdf876.pdfIn PDF document text
    • https://tavigawatogup.weebly.com/uploads/1/3/5/3/135389884/kojebavezuwila.pdfIn PDF document text
    • https://wutiboduselojo.weebly.com/uploads/1/3/4/6/134665342/venunisovaret.pdfIn PDF document text
    • https://tezilejesitox.weebly.com/uploads/1/3/1/1/131163634/acf331fbb638.pdfIn PDF document text
    • https://sofubile.weebly.com/uploads/1/3/4/3/134380394/gogapuben-renaxepetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415543/normal_6052752f05a6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuranosa.pbworks.com/w/file/fetch/144416781/cheat_crystal_marvel_future_fight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50f4c580-2386-4c58-a15a-4ad554df0601/what_is_32_bit_word_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5e37b3f-6e49-4b19-b9ff-f73f14114677/personal_development_plan_examples_for_executives.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/f/jack_and_the_beanstalk_book.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/where_to_watch_free_movies_no_sign_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57f109af-2907-4793-bebe-11eff9913918/home_comfort_wood_cook_stove_manual.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/bulurilikajepikopesazuz.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/captain_america_super_soldier_pc_game_download_apunkagames.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_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 5428 bytes
SHA-256: ab07f431e6ba7b050085321514ecdf9039edeaf14393d19cd7976e5c103653be
font_01_sfnt_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 10848 bytes
SHA-256: 057cf39e8c7f729875deaf4a60a1d38eaefacc01b803a470df29a7301a1dfcba