Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b8793df880a0e1…

MALICIOUS

PDF

70.4 KB Created: 2021-02-17 07:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dca9917a6054dfa6cf982b13279ddc15 SHA-1: e31ba0e1439a80ddbdab263907b21de410b42236 SHA-256: a3b8793df880a0e11e0000b1bc1a2434d76060e1b6e3597d94190d80d9e670e8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://bologen.ru/wix?keyword=estado+de+ganancia+y+perdida+importancia PDF link annotation
    • https://gojupisot.weebly.com/uploads/1/3/4/0/134016698/896415.pdfIn PDF document text
    • https://tixuxawopor.weebly.com/uploads/1/3/0/7/130738504/menaletakaxibutix.pdfIn PDF document text
    • https://sowurudiz.weebly.com/uploads/1/3/1/4/131438308/97e53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499300/normal_6008fcb8a2804.pdfIn PDF document text
    • https://bovagisobupuzod.weebly.com/uploads/1/3/1/0/131070774/zikonoxami_vawafezeroxijur_jakapura.pdfIn PDF document text
    • http://rigojakivuvemi.iblogger.org/kutojoxutonugebaweledok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/37170449804.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/compelling_evidence_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/fofojolavowipevixo.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/11090841523.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/8085_microprocessor_lab_viva_questions_and_answers.pdfIn PDF document text
    • http://sovuberexizizir.epizy.com/soxaboxobidumosogefupu.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/crack_your_mobile_screen_prank_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/vebalifomu.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/soldier_s_home.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_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 5420 bytes
SHA-256: b50a961439706add8de0e8f753a384bce2f4277957d5ef3e8704aac07bc42f22
font_01_sfnt_off0000e4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A6 11864 bytes
SHA-256: 4a8a215cb54015f075dc163b94b93f007f6b207e89b3f0be0b601e0b9c747b00

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