Malicious PDF — malware analysis report

Static analysis result for SHA-256 544750db273dee91…

MALICIOUS

PDF

74.7 KB Created: 2021-04-20 12:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 50437f6555e9a8a2a4dd959b2564d168 SHA-1: 3e4d50ad36655118fd9ac28c29d8d5a2a24ee3a6 SHA-256: 544750db273dee911d4f6736a2b66cd2bb28167cab7ab3b126f0bbc227a08aca
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or phishing. The document body, though heavily obfuscated, appears to be a pretext for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=how+soccer+explains+the+world+chapter+8+summary PDF link annotation
    • http://puwofipafemuvif.22web.org/bomberman_2_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388065/normal_5fcb4d8591b1a.pdfIn PDF document text
    • https://dadekojulaza.weebly.com/uploads/1/3/4/3/134320805/pubowikuxalun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486034/normal_605f9131e1801.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/ifL78ii/ionity_charging_price.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/Uwtgdji/3d_maze_ball_domino.pdfIn PDF document text
    • http://maxidadikegi.iblogger.org/endosymbiosis_worksheet_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_605c305ade1db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_601615b2ce97f.pdfIn PDF document text
    • https://fugopezawisobib.weebly.com/uploads/1/3/1/3/131383650/tebumowemata.pdfIn PDF document text
    • https://jalusuduzewot.weebly.com/uploads/1/3/1/4/131456012/9bb99f2a302c.pdfIn PDF document text
    • https://cdn.sqhk.co/kosuxatune/SLjhcZV/tap_dance_classes_for_adults_chicago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_6065da033dbf8.pdfIn PDF document text
    • https://cdn.sqhk.co/rogolafu/bBiANWu/26134549854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_602ee749c071d.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/Sjcxohb/nawufogofevibitadigeper.pdfIn PDF document text
    • https://sosufafa.weebly.com/uploads/1/3/4/8/134862430/pemixu-foxaj-gubux-worujenimemoba.pdfIn PDF document text
    • http://zoxuruje.sportsontheweb.net/shunt_capacitor_filter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5fcc2bca4f0be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_6024cef90d72a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/renin_aldosterone_angiotensin_system.pdfIn PDF document text
    • http://fevusavumerow.rf.gd/naxewunikowaxonazul.pdfIn PDF document text
    • http://naxefugoxodikow.atwebpages.com/vawufapumilipukine.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 5728 bytes
SHA-256: 6e3b327b3ae0e650c3502c3fc62184bad025dcdda04ff8fa5ed5ca647fa13615
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 10476 bytes
SHA-256: 72ff80bd2ebbfc889bc81d5845950dbabb50cd24288be5575defdc8b6cbf717d

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