Malicious PDF — malware analysis report

Static analysis result for SHA-256 840ade6850b4145c…

MALICIOUS

PDF

86.7 KB Created: 2021-04-03 10:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44aafb44561b48823d1e1f97e7541f31 SHA-1: afdf877e6bd9cc6743315f65d53b0c48c293b628 SHA-256: 840ade6850b4145c03f40de84131127298a6f8db1db84c712614245dffb0f2fa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to generate SEO traffic. One of the primary URLs, 'https://pelibifir.ru/123?utm_term=solidworks+flow+simulation+tutorial+2014+pdf', appears to be a lure for users searching for specific technical content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://pelibifir.ru/123?utm_term=solidworks+flow+simulation+tutorial+2014+pdf
    • http://kutakelipaxeb.22web.org/loladaluxelunenibiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zitasixan.atwebpages.com/pentair_pool_pump_assembly.pdf
    • https://9f2a6cc1-6e15-4467-beaa-57274ca996ed.filesusr.com/ugd/78f4c3_210143faa92f41ac9ae593519156fb0f.pdf?index=true
    • https://dd6f0c70-611b-430f-b219-ee0593fd0e1f.filesusr.com/ugd/d60051_c7be083d02594b7e9aae43d0bd35a605.pdf?index=true
    • https://827a6da4-a69c-4806-aaaa-db522494bc4d.filesusr.com/ugd/cb5916_e352a0fcca1c40ef9fbf2b8238945c79.pdf?index=true
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_ad1c5f4fd69f4420a41f844ba29d543e.pdf?index=true
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_78f3f7d56dc44f4284b8973777540b05.pdf?index=true
    • http://lakekawe.rf.gd/astragalo_anatomia.pdf
    • http://ligujizulogi.atwebpages.com/vadivene.pdf
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_cd141353468048fcb4cebda9778ef205.pdf?index=true
    • http://damewanobojojo.rf.gd/citadel_investment_group_annual_report.pdf
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_a0103e19cac84521a28681f1d82a5dec.pdf?index=true
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_16bd06a68fae4d778d76e838baad8775.pdf?index=true
    • http://defujusavoxo.rf.gd/95278976346.pdf
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_63b0d09736fb493aa5d9dee5ff2ac78f.pdf?index=true
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_0421068ccc964e75a01726819f994ecf.pdf?index=true
    • http://wukevivetarapu.myartsonline.com/cause_and_effect_essay_template.pdf
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_e1e46e493e8b4f65927557e2fd0278ec.pdf?index=true
    • https://51364a6b-283d-4537-b9df-48522fd8faf2.filesusr.com/ugd/921180_2103e349c5644e59baa82ef922edee3a.pdf?index=true
    • http://bakenexiradofo.epizy.com/ganasuxomerebijirel.pdf
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_2afebf8849f1472ca9357f356fee7864.pdf?index=true
    • https://264cdfe8-48fc-440e-bff3-938583425051.filesusr.com/ugd/cd20dc_a078cb7cacca4de8a9f7d0d1884f460c.pdf?index=true
    • https://16b16ea1-1eac-4681-bfdb-39d0b7b0c60a.filesusr.com/ugd/d6b497_ef52b29dd43348739b73d03ad9daffc1.pdf?index=true
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_d7cbecf37982452c8028d287eb128768.pdf?index=true
    • 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_off000111cf.bin
2737a5336a9dfda32b1447809ba703bec9b81d28ffdb21a07e6034393f4ae7d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 5860 bytes
font_01_sfnt_off000125c5.bin
5058bc3c0e14167c59c4e1b29ddb3030e5f0ec003b9a41926873e3a73339300d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125C5 11572 bytes

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