Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea09288ef58ad57…

MALICIOUS

PDF

69.2 KB Created: 2021-02-03 01:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 448bc16604eb52aeefb28c55f29e5f55 SHA-1: e9c1988cf39ea9ce0dfdae150b2439fd7af51f3a SHA-256: 7ea09288ef58ad5789facb2963c9322b68d39882731851d3cb1e9f92d90db84c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating a large number of external PDF links, including one pointing to 'jottigo.ru'. The document body, though heavily obfuscated, contains fragments suggesting a lure related to 'sexy wet t shirt' and metadata indicating it was generated by wkhtmltopdf. The presence of numerous external PDF links strongly suggests an attempt to direct users to potentially malicious content or phishing 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/123?utm_term=sexy+wet+t+shirt PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449783/normal_5ff1368dbddee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5fe10c6a01389.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/t2xXCgi/46998777818.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/QQ6gion/crossing_over_occurs_between_tetrads.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5fd8fac2bc30d.pdfIn PDF document text
    • https://cdn.sqhk.co/juvexafi/ifhcpjf/dirt_bike_racing_shirts.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/gjgorjG/vikings_season_3_episode_1_imdb.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/0L5zsjf/redizure.pdfIn PDF document text
    • https://zujetopefij.weebly.com/uploads/1/3/4/7/134766602/zovegupizufalo_jozudon_jexem.pdfIn PDF document text
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/eb621a95f63f5a4.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/relezase-bawapaxubuwimil-povek.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/hc89ies/vegude.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/jvjijdO/tourism_business_plan_examples_for_students.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/jivamubug/rogomefuwebidola.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/bmj_case_reports_consent.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/lobiwirevibil.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_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 4896 bytes
SHA-256: 3334f62513ed88ab67adf069506934be74ea6cb57bae3a2fffa406556b6ea8fa
font_01_sfnt_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 10580 bytes
SHA-256: d926f66aaaddf81e2cdaa94197de438d706eb8a3718654d7f2a5d9ba8d5db9c0

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