Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf3dc335271ba6d…

MALICIOUS

PDF

99.8 KB Created: 2021-04-01 01:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 446bdc7c8bac28f48bf0b3de7e1500a3 SHA-1: c517fb5e08e5042f5df360141b329df1493c3ec2 SHA-256: 9cf3dc335271ba6d00b5001a0d286830cb1e468c64b4f766918378dae4dab7b1
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with a specific heuristic identifying it as a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external links points towards a phishing or content-luring attack pattern. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://midufefew.ru/123?utm_term=latest+android+tv+box+2019
    • http://bettermoneytips.com/sosagewovozixujumuzilupekyr.pdf
    • http://ilkertr.shop/d_easy_way_to_stop_smoking_by_allen_carrkmlfe.pdf
    • https://sikukaposarimi.weebly.com/uploads/1/3/5/3/135307882/2259752.pdf
    • http://fapseo.ru/26021430369kmo72.pdf
    • http://themarkuzmusic.com/kofobikuwanasutizabosw60c5.pdf
    • https://valetapos.weebly.com/uploads/1/3/4/2/134265584/nadodinadaloteje.pdf
    • https://pixirexujana.weebly.com/uploads/1/3/4/5/134527097/33249b455ac658.pdf
    • http://garant-ritual.online/the_balance_in_the_income_summary_account_before_it_is_closed_will_be_equal_touu9gh.pdf
    • http://se-mrush.com/26320867256rhc45.pdf
    • https://romenazojojeles.weebly.com/uploads/1/3/0/7/130775884/be7ffbd545e9.pdf
    • http://tacfitproducts.com/does_dunkin_donuts_french_vanilla_coffee_have_sugar_in_ityqci1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nunitew.rf.gd/airway_management_devices.pdf
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_5e530f004dba4f77a8d494facd6d5a04.pdf?index=true
    • https://4bbf79d8-97e4-42de-9a75-948158c354f0.filesusr.com/ugd/52f5d3_96b8dd0de5534f5699710f4850df48d5.pdf?index=true
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_b8082e833fa948ec863f64fa47137b1b.pdf?index=true
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_a12a8973321b4f68b5b0d5c6557c71ad.pdf?index=true
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_d23c390715d74ae6a67fd86eabeaff9f.pdf?index=true
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_f82198db71844cd0b6817d30b1c9fd94.pdf?index=true
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_e365366d35b34c7680a0a8a681b6f8f8.pdf?index=true
    • http://jovupoxorunalox.epizy.com/zupifadupowuwubo.pdf
    • http://napalujimawoz.rf.gd/gowebesevuvijaruwusa.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_off00014885.bin
52f9c91b9003410c86c86df4d20616bb26a57fe59ca77a74bf1f426e896875d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14885 5476 bytes
font_01_sfnt_off00015b34.bin
294511a318b702df7f03312ab10adfc4335e2cc1a5374ec3ca83c271351947fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B34 11568 bytes

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