Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c96e51841d5ada…

MALICIOUS

PDF

67.1 KB Created: 2021-02-24 23:46:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b9cb66436f17ea6153b2db87c3c914e6 SHA-1: 0962da4e8d8ebfbefc0c4872df8114da43398987 SHA-256: 51c96e51841d5adab61e2e6d5f794fcb2ef3588be91b8f365432aeef9ee714bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support the conclusion that this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=accu+chek+aviva+plus+meter+cvs PDF link annotation
    • http://fruittea.space/5085520126048zkz.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/how_to_determine_windshield_wiper_blade_size.pdfIn PDF document text
    • https://vemisalisak.weebly.com/uploads/1/3/1/4/131437925/8803570.pdfIn PDF document text
    • http://herss.space/73397591768r5dr6.pdfIn PDF document text
    • https://ninisezidopif.weebly.com/uploads/1/3/5/3/135391617/3a5a6bdb.pdfIn PDF document text
    • http://form-copyrightservices.com/xatonemakajaxagafu2b8ns.pdfIn PDF document text
    • https://budekimezarusij.weebly.com/uploads/1/3/5/9/135964348/motudiliribiv.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/hf0zja3/48535880804.pdfIn PDF document text
    • https://ferofetilusef.weebly.com/uploads/1/3/5/3/135346026/c883697.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
    • https://s3.amazonaws.com/bubisifapagefe/tiliwizako.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/practice_sheets_converting_decimals_to_fractions.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/formule_chimique_vinaigre_et_bicarbonate_de_soude.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/repomiro.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/crocs_us_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/carson_crying_meme_template.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_off0000be4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4C 4952 bytes
SHA-256: 36f71232d44af0100e2eb9a5a4be906b2109aed8f637a29da88ef2414fb618c4
font_01_sfnt_off0000cf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF24 10032 bytes
SHA-256: 06ba17dda70954ada7ea491f8ce3677f4b0c0b72a1ba6bd41765aea6a89ab719
font_02_sfnt_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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