Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea5cbce7c38295e…

MALICIOUS

PDF

79.4 KB Created: 2021-03-12 08:26:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d459aceba5cac14a19bc12eb57bbcda8 SHA-1: ee3c1f83e2e280655631d490fc33e9ecb78c3998 SHA-256: 8ea5cbce7c38295eb96cf6da7f0bec96b639a496b01a4c9b4ab7943f21f86fdd
186 Risk Score

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 and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=vermont+castings+encore+2040+manual PDF link annotation
    • https://cdn.sqhk.co/zofagopipowi/gwieiby/67365821661.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/learn_english_online_free_course_audio_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxedanafowa/Mgjjejg/gidikufubova.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/carbon_atoms_bond_together_to_form9hf0z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413112/normal_5ffa6aa86f3c1.pdfIn PDF document text
    • http://idealicaitalia.website/rekoverun98gga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443574/normal_5fe2e7de26771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453732/normal_6013073b3df02.pdfIn PDF document text
    • https://cdn.sqhk.co/dipujabuxiw/icjiRgh/8215214532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_601f099de0daa.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/eGFzhdO/exchange_starbucks_gift_card_to_bitcoin.pdfIn PDF document text
    • https://cdn.sqhk.co/sesakiwewe/hihfAje/dance_virus_siliguri_west_bengal.pdfIn PDF document text
    • http://lifeit.pro/mebaludubofogonigufotcvxm.pdfIn PDF document text
    • http://galabogenezoso.getenjoyment.net/jexifojarifuxuwipop.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/Yhe2tQm/zatizitebuwigenareregoka.pdfIn PDF document text
    • https://cdn.sqhk.co/tetolonul/Hjihb9w/27218597949.pdfIn PDF document text
    • https://cdn.sqhk.co/ruperodu/higfhge/tukanavufogikitagopamamu.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/hhjgwvh/geometry_parkour_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligoroxenafof.atwebpages.com/tigoju.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_e55210a101354aeabeeb53353385300d.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_4f2e0f4a320649c1af93d18020332004.pdf?index=trueIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_49e820ee11fb4440ba5c9c28c8d17ca5.pdf?index=trueIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_66806875dbdf4bf7bac434adc934c644.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_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 5448 bytes
SHA-256: 5eae1a39f763e54d7e6553b0319c00538d6734132876d0b55c4ff4894aabd893
font_01_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 11032 bytes
SHA-256: 70c10235c382c320e2a519a274043a566fb403f17eb43ff6588635c7101923cf