Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ff007e68a9f09a…

MALICIOUS

PDF

82.8 KB Created: 2021-03-12 11:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 2791f05038671abe84cad5415cb104c2 SHA-1: bc857975ea1719473c40415b3de0a7fbc325a918 SHA-256: 43ff007e68a9f09a2a685b1d11eec6b67f495571869827218f78ba659f93d721
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs points to an attempt to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=firefox+47.+0.+1+32+bit PDF link annotation
    • http://fajasated.mywebcommunity.org/66527050792.pdfIn PDF document text
    • https://jazowamiwig.weebly.com/uploads/1/3/2/7/132740249/pujumejuji-tasapufi-datalos.pdfIn PDF document text
    • http://kzrovk.xyz/brandon_burlsworth_death_photoshoa5g.pdfIn PDF document text
    • http://cetakchantek.com/vizio_sb3820_c61ylvr.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/dupazozevig.pdfIn PDF document text
    • https://binamakizixevuj.weebly.com/uploads/1/3/2/8/132814618/6734901.pdfIn PDF document text
    • http://watogoda.mypressonline.com/1945814969.pdfIn PDF document text
    • http://bathforlegs.xyz/derewelejar6hr.pdfIn PDF document text
    • https://situzofunuk.weebly.com/uploads/1/3/5/3/135305293/fizewimon-denuwuveva.pdfIn PDF document text
    • http://nibewubixela.getenjoyment.net/how_to_write_an_expository_essay_for_4th_grade.pdfIn PDF document text
    • https://telexetobowu.weebly.com/uploads/1/3/4/3/134339901/15d5c10.pdfIn PDF document text
    • http://tanijijud.sportsontheweb.net/dejikikideg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_1258c6de50254ac28117711f7e83ffb4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da79afb-f48a-4559-b011-f6e1ef16e6bf/qual__o_melhor_curso_de_marketing_digital.pdfIn PDF document text
    • http://wufikemofumop.atwebpages.com/zipefomidafatonojupowunu.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_094edb1204dc4dc48404a07b83372b1e.pdf?index=trueIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_69da601cd4504cf2b04a5545c17bbd35.pdf?index=trueIn PDF document text
    • http://sogoxutagejuno.atwebpages.com/bayam_duri.pdfIn PDF document text
    • http://dowafirowelumex.atwebpages.com/57270068720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a73ee5a-88ae-4a43-a2e0-c1faf9be8ec7/words_that_start_with_obe.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_52828078f65042799f2c4aec35ff60ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e54c958c-9ca2-493f-a15c-afad2765bf9d/35340678248.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_4fe011b18a87490cbde278f151a85e23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a94794c-1fa0-4643-8d8d-51996a14baf4/how_to_reset_honeywell_th8110r1008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52d6229f-17a8-4a61-b122-19766c64e3e2/vilamalixoxunid.pdfIn 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_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 4876 bytes
SHA-256: fd46670e077c08196aa68f6b3b579ac0bd0c48ac086a0ef4b53b175c56d718a7
font_01_sfnt_off000109bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 10724 bytes
SHA-256: c9effa45fdbf3d833c36f4970a69e08e82a0277bf39e2c3445370a88aad4edea
font_02_sfnt_off00012dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFA 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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