Malicious PDF — malware analysis report

Static analysis result for SHA-256 e776d265069488ff…

MALICIOUS

PDF

95.4 KB Created: 2021-03-10 19:10:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 253e80d996671ac5d649bd4e77968930 SHA-1: bec070dfc6b326fac645f5b9170742c72f59c1a4 SHA-256: e776d265069488ff76ac138d8653491d1bce493c19656aa787970cda8d563449
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the extensive URL list points to a strategy of redirecting users to potentially harmful content.

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://kuzutuzo.ru/award?keyword=agenda+escolar+2020+pdf+para+imprimir PDF link annotation
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/8801201.pdfIn PDF document text
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/7969060.pdfIn PDF document text
    • https://lotojenamiz.weebly.com/uploads/1/3/1/3/131381761/gelofobujov.pdfIn PDF document text
    • https://wamabiror.weebly.com/uploads/1/3/1/1/131163705/8988905.pdfIn PDF document text
    • https://lowexupunodod.weebly.com/uploads/1/3/4/8/134896298/1455683.pdfIn PDF document text
    • https://cdn.sqhk.co/gefizorabubi/NhdJicb/labidejekamawubumurukos.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/6gi6ign/vefebimazinodebi.pdfIn PDF document text
    • https://funoridarudaru.weebly.com/uploads/1/3/5/3/135304061/tegulefinilon.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/iTgeiea/outbreak_perfected_solo_loadout.pdfIn PDF document text
    • http://motegolev.22web.org/jixajewim.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/ahfgcYy/idle_human_alien_unlock.pdfIn PDF document text
    • https://xabizukilitexe.weebly.com/uploads/1/3/4/3/134335342/mesisutenagex-xatikesikil-rotogemubes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palezonipegodaf.epizy.com/zusulaxubidulazodopuleben.pdfIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_b3646ffa1f4847e89eb22ceb0c5100bc.pdf?index=trueIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_ba00c01191124fdaac5c4eb7df4a4478.pdf?index=trueIn PDF document text
    • http://fanuzisi.epizy.com/virginia_woolf_orlando_analysis.pdfIn PDF document text
    • http://bigofuzov.epizy.com/what_ink_for_hp_officejet_pro_8600_plus.pdfIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_8a28f751d8c04e88a0e3affbf7a625a0.pdf?index=trueIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_0a91fc94161c4618a84e4a333582ce8e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10740 13844 bytes
SHA-256: eb49db1269dd7c3a2f718f5e0d6cf37910a2fa558e6ec64c4a94fa70c7a827f8
font_01_sfnt_off000133bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BF 5740 bytes
SHA-256: fbd0ed3e4f343ba279035e926d37cf1c2893ce774ef94740c4ec4dddead4c01f
font_02_sfnt_off00014738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14738 11740 bytes
SHA-256: fe863de596e007b2f3c93c67f1d8c3bacc6e853e48403b7a8af5f2b2f490c556