Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bac0014b2eee81…

MALICIOUS

PDF

70.0 KB Created: 2021-03-31 21:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cb72376a0ef2b5bda1948d905e5815c SHA-1: 1f2b122f8c456534cbfb353dafad72055df670da SHA-256: 76bac0014b2eee8175084b16d18c07a70e73e984f8dad590998c5b6503d49dc1
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to malicious content, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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 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://nipisod.ru/wix?keyword=bill+nye+chemical+reactions+worksheet+answers
    • http://folejaf.mypressonline.com/bogofuxu.pdf
    • https://static.s123-cdn-static.com/uploads/4480387/normal_5ff6910cdc968.pdf
    • https://cdn-cms.f-static.net/uploads/4470982/normal_6051ad2e42dd7.pdf
    • https://cdn.sqhk.co/vezukefuza/gcgegfb/gotugonebatofenanod.pdf
    • https://cdn-cms.f-static.net/uploads/4447084/normal_602c590d593ef.pdf
    • https://xisezuvu.weebly.com/uploads/1/3/4/0/134096300/vimatemuvewodi.pdf
    • https://lebotuzipum.weebly.com/uploads/1/3/4/5/134519329/6315457.pdf
    • https://cdn-cms.f-static.net/uploads/4471706/normal_600dea10d4b53.pdf
    • https://cdn.sqhk.co/miwizawi/f1jfYia/pusiferinefosoxokutifisas.pdf
    • https://cdn.sqhk.co/pifajaloro/gfjhXp6/zojoteneduketatote.pdf
    • https://xexemisekugo.weebly.com/uploads/1/3/4/6/134679242/773273.pdf
    • https://cdn.sqhk.co/derilunadine/qFhephe/96268860779.pdf
    • http://gosoxegekiri.mywebcommunity.org/todd_lammle_ccna_wireless_study_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4451348/normal_60475c0330979.pdf
    • https://pezazexumazu.weebly.com/uploads/1/3/5/3/135392870/kosofud.pdf
    • https://laxebuwefe.weebly.com/uploads/1/3/0/7/130775048/68f82b5a69ee.pdf
    • http://fowagovujag.22web.org/whats_the_grace_period_for_expired_drivers_license.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://guduzazuki.epizy.com/mekoxok.pdf
    • http://sufapanizesemot.epizy.com/80309632562.pdf
    • http://faxunarin.epizy.com/letter_h_worksheets_for_kindergarten.pdf
    • http://vokifanebol.rf.gd/javuluzekidogavaparage.pdf
    • http://parotajin.rf.gd/what_causes_a_furnace_not_to_ignite.pdf
    • http://mekofirudusem.rf.gd/65550701300.pdf
    • http://wevumixedin.rf.gd/punctuation_rules_with_examples.pdf
    • http://dipubuwefo.epizy.com/autocad_electrical_free_download.pdf
    • http://wororezijetixa.atwebpages.com/is_the_serenity_prayer_found_in_the_bible.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d588.bin
9542069fabae223ab61500082e304ce9f2467d025cd3488d9949cf4bf4797339		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 5348 bytes
font_01_sfnt_off0000e79c.bin
11e3fefd977973ea7ea424e403e0e84d02d34494f0091cba1eebaa682b486d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 10120 bytes

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