Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a3c708e0110c7b…

MALICIOUS

PDF

80.4 KB Created: 2021-02-14 12:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 50acc7205cd3c784261859fe0ee914e6 SHA-1: 79cb33154f6ef6fb854133860a1bbe104bf67310 SHA-256: 82a3c708e0110c7ba227a307ae7f6dab5eac34e2e89b3f66e7c4b8d119c30250
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing sites, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://jottigo.ru/aws?utm_term=fractionation+action+checklist+pdf PDF link annotation
    • https://cdn.sqhk.co/bidusowo/01gjicV/88647657385.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/RFgehdI/celebrity_cruise_line_stockholder_benefit.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/3jgcWjc/34953448305.pdfIn PDF document text
    • https://sejesomizibiji.weebly.com/uploads/1/3/5/3/135346687/lolojezuwejuz.pdfIn PDF document text
    • https://fajevubesupuvax.weebly.com/uploads/1/3/5/3/135387480/6750893.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuzadisup/f9DjiiQ/20410540919.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/gjeQ9id/97118000289.pdfIn PDF document text
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/juwirejolu.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/c6b012e4930ec89.pdfIn PDF document text
    • https://vafevovelawa.weebly.com/uploads/1/3/1/4/131407112/wejavikikuvit.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/iqXpibI/51204585004.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://janosunitemixe.epizy.com/marriage_anniversary_wishes_in_marathi_free.pdfIn PDF document text
    • http://risitikavaj.rf.gd/jambox_mini_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/kafefewogus.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/tadalinuv.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/money_supply_m1_m2_m3.pdfIn PDF document text
    • http://jiporiri.rf.gd/sofipadafif.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/alexander_movie_tamil_dubbed.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/combined_gas_law_example_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/angularjs_client_side_template_injection.pdfIn PDF document text
    • http://fedatowuka.epizy.com/loctite_638_material_safety_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/rigapapumegofegavasuf.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_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 5264 bytes
SHA-256: a1e35c9cd522daafd6504caddd77f686e851c848d75126b0ed0f5864689e512a
font_01_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 9972 bytes
SHA-256: d1c2b038f98e491d3e22013bd38bb609ec38a44d5378dde676810b83db40e6ce

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