Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40b849c791eb017…

MALICIOUS

PDF

82.6 KB Created: 2021-03-18 10:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e42e9d9ffda76a85634d3ab6ab3eb648 SHA-1: 78096ac863b7be081c60b0d4edd56c93dc1cb875 SHA-256: e40b849c791eb017a975f660178b4f480fb973c3356266df0b5a1846618f0574
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming operation. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/strik?utm_term=washington+post+comics
    • https://vomanoxugorufo.weebly.com/uploads/1/3/5/3/135331351/ad1cb0adab7.pdf
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/winirunajisenal.pdf
    • http://fikosarodone.medianewsonline.com/what_is_the_best_heater_for_above_ground_pool.pdf
    • http://gulibej.22web.org/somigexifegojelupatujim.pdf
    • http://remawunusubo.22web.org/squadron_bullet_hell_shooter_apk.pdf
    • https://betataniboluwi.weebly.com/uploads/1/3/0/9/130969090/fulagipojasiwawiwex.pdf
    • https://ruwegevenimeva.weebly.com/uploads/1/3/0/9/130969935/lowususaz-lusesaj.pdf
    • https://fanakigefepawaf.weebly.com/uploads/1/3/0/8/130873796/0832bffd13863.pdf
    • https://noparerekum.weebly.com/uploads/1/3/4/6/134639333/1742061.pdf
    • http://wigoduxaru.22web.org/nosasogovonukukanevel.pdf
    • https://jipoditewiwes.weebly.com/uploads/1/3/4/8/134875435/gevalifegixagod_jewip_wemegu_lakazopozi.pdf
    • http://bapadama.medianewsonline.com/business_plan_example_south_africa.pdf
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/bisawojafa.pdf
    • https://rodofuzox.weebly.com/uploads/1/3/4/5/134599037/binidiledetax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/litunux/shimano_fc-r2000_claris_compact_chainset.pdf
    • https://s3.amazonaws.com/jinotugiwomo/cinemax_nitra_program_zajtra.pdf
    • https://s3.amazonaws.com/bipepezuwed/meaning_of_agrarian_reform_in_tamil.pdf
    • https://s3.amazonaws.com/debiwelof/body_for_life_turkey_chili_recipe.pdf
    • https://s3.amazonaws.com/mejobu/narorale.pdf
    • https://uploads.strikinglycdn.com/files/304bc42e-171b-43b2-af85-4ee6402df096/51983775319.pdf
    • https://uploads.strikinglycdn.com/files/f2395124-35de-4057-94b0-95ae0006c2b0/what_exercises_build_upper_body_strength.pdf
    • http://zevesijuduma.atwebpages.com/can_i_study_electrical_engineering_online.pdf
    • https://uploads.strikinglycdn.com/files/b6f1dd5b-61b4-4ad8-9e14-dc4264714db8/wufevosavefulezimafisunov.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_off00010601.bin
9e06dad31e17aac56bf617fb08b5fba6ee9e3affbf090fb6ce6d9078c715454c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 5232 bytes
font_01_sfnt_off000117be.bin
19d7ad68f9ab12c21a62b335e0816235f1d0fa8008d650cffb94f49896005a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117BE 10896 bytes

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