Malicious PDF — malware analysis report

Static analysis result for SHA-256 df81c9c7f6c13173…

MALICIOUS

PDF

80.1 KB Created: 2021-05-17 00:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: aedf661d73123a70a4d0d11d08628794 SHA-1: 20de246abbc682c5df4d2974b7f58883608c00ea SHA-256: df81c9c7f6c1317324b63c542b8d8b3c5422ea057fc077b75063baa5ca8e18e0
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=pain+management+theories+in+nursing PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368237/normal_5fcfefbc9f2af.pdfIn PDF document text
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/5246794.pdfIn PDF document text
    • https://jonomivebotuw.weebly.com/uploads/1/3/4/6/134683751/1121200.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/ihifijv/war_of_galaxy_apk_mod_unlimited_crystals.pdfIn PDF document text
    • https://datipozor.weebly.com/uploads/1/3/0/8/130813945/0f1a97d87f1bbf.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/d6hgjij/diversified_meaning_in_malayalam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471706/normal_5fdf2cbd98a01.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/auditing_and_investigation_ican.pdfIn PDF document text
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/rifojujuxujodit.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
    • http://pewavifasovifuz.epizy.com/ziwijowuvomalab.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/25113593761.pdfIn PDF document text
    • http://dolaregasa.epizy.com/how_to_block_caller_id_when_calling_from_a_cell_phone.pdfIn PDF document text
    • https://ab7636f0-620c-4d49-ab1b-28e434a5f3c2.filesusr.com/ugd/cacfd7_b8e3284ffea14ec6a4b77eb9c3a59ebd.pdf?index=trueIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_ad8792b6082d4a058ae40a8dd353e1ab.pdf?index=trueIn PDF document text
    • https://26b54b0d-7067-4615-bd5a-e9f638bc9197.filesusr.com/ugd/26f5b5_2d9fa49bf8464b46bb303488ac6733d8.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_7e289d3919544e239914c92fc1d1e7dc.pdf?index=trueIn PDF document text
    • http://nanizezuzodujo.epizy.com/dixie_chopper_xcaliber_4x4_price.pdfIn PDF document text
    • http://nifuwisenomu.epizy.com/coriolis_flow_meter_principle.pdfIn PDF document text
    • http://varirojemixu.myartsonline.com/zizivudopote.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_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 4948 bytes
SHA-256: 13768ddac39c8a22cfe6d0268ac410fc4b5b2513f2224898e2b42caaefd8537f
font_01_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 10948 bytes
SHA-256: b6ec1130caf7fda4c4f4e9586ec13a3f7ba02fa977516d46b8111f29bbaf13d8
font_02_sfnt_off0001250c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f