Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c357fd870b89e9c…

MALICIOUS

PDF

86.7 KB Created: 2021-03-23 00:27:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 59c45910629f4706b1bfccb2c8fabb89 SHA-1: 6587d8ec49b8cdbd0020f80013094075b1ed97c5 SHA-256: 3c357fd870b89e9c1f6021afd2d7a8007bc93aa9696a2913380065e835d79749
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The document body is heavily obfuscated, but the presence of links and the ClamAV detection strongly suggest a phishing or redirection attempt. No scripts were extracted, but the malicious links are sufficient to indicate a high likelihood of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=brayton+cycle+with+regeneration+pdf In PDF document text
    • http://vitetoka.scienceontheweb.net/traducir_un_documento_en_de_ingles_a_espaol_gratis.pdfIn PDF document text
    • http://sanelobazigi.medianewsonline.com/fivuselo.pdfIn PDF document text
    • http://datiwufirul.medianewsonline.com/wepefefodim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383170/normal_60021770bb3a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_6024fe7823fe0.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/how_to_avoid_pattern_day_trader_rule_robinhood.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_6057d95349d4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_604d18a35993c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463824/normal_5fee1e995e49b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450438/normal_6002843b36753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475738/normal_604f56532d99d.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/15875890787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kapowuxivi.atwebpages.com/statistical_methods_for_research_workers_fisher.pdfIn PDF document text
    • http://bekogufepe.rf.gd/celcus_tv_manual.pdfIn PDF document text
    • https://2aa0b900-127f-4603-a19a-6a731d3c9eb1.filesusr.com/ugd/5eaffa_58ef87bffc1941e8a9667eee365bbbaa.pdf?index=trueIn PDF document text
    • http://sujonereduvuk.rf.gd/bed_sheet_stores_near_me.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_66271c0779bf4c77985ecadaf6b04a0d.pdf?index=trueIn PDF document text
    • https://034b020c-baab-45d1-b3ff-c950d21f9178.filesusr.com/ugd/3c93bc_56975ad2bd0247809ebb633c1a808a74.pdf?index=trueIn PDF document text
    • http://fibajufe.rf.gd/local_government_budget_process.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/amana_microwave_light_bulb.pdfIn PDF document text
    • http://ligesetuvijaga.epizy.com/sherawali_maa_ke_bhajan_free.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_b66450aad40b48d2b531d0dd380f9282.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 5480 bytes
SHA-256: e7b6976757777ff16776692817eed0b3c22b58b50317545a1dfe20a0e1f979c1
font_01_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 11504 bytes
SHA-256: a907fa6600af13e5c1f7de867496c48640b68f86ab2b78e9b346a15847de5bf9
font_02_sfnt_off000137ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CE 16144 bytes
SHA-256: f7282090e270060608fdc575ded0b184a97243f724fc845514d2e81390c10c7f