Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d17dab4f036d01c…

MALICIOUS

PDF

72.1 KB Created: 2021-01-19 07:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 90825e4a1fc49c735d5349750290f2dc SHA-1: e80725c33555ab98c7e0a21bd464f49bd550a773 SHA-256: 6d17dab4f036d01c54514a9816df91992428d042deff2264fe030887e0b782d3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The presence of a URL with a 'utm_term' parameter further supports the idea of a campaign or phishing lure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffset.ru/123?utm_term=masamune+kun+no+revenge+season+2+episode+1 PDF link annotation
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/dosozizexu_bivegat.pdfIn PDF document text
    • https://repugololenip.weebly.com/uploads/1/3/4/8/134880500/xoxubiwod.pdfIn PDF document text
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/kodufaroxetibez.pdfIn PDF document text
    • http://xilofomodat.iblogger.org/pobolabuvajunarevozib.pdfIn PDF document text
    • http://xudisoda.66ghz.com/trance_albums_2018.pdfIn PDF document text
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/6597871.pdfIn PDF document text
    • https://zibozofos.weebly.com/uploads/1/3/4/8/134896422/4910785.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xujogefup.rf.gd/chogada_tara_song_bestwap._link.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/67035361895.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/lesson_6.3_arcs_and_angles_answer_key.pdfIn PDF document text
    • http://fubolorira.epizy.com/85027593037.pdfIn PDF document text
    • http://kajomeki.epizy.com/automatic_control_system_textbook.pdfIn PDF document text
    • http://tezebidurob.epizy.com/guided_meditation_script_for_stress.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_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 5560 bytes
SHA-256: 2eb36e5d71ba09eb3eeaafd7b7c2589a1aaded8fed00a5b4d000e23c8a0d8b9e
font_01_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 10356 bytes
SHA-256: 085f4cac8beafd6b1155051a847ec167655de885d33f7a78c7f7068c2cf78742

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