Malicious PDF — malware analysis report

Static analysis result for SHA-256 f919e57b55881cf7…

MALICIOUS

PDF

80.3 KB Created: 2021-06-06 22:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a6744331b4b7d8e35e0696f5db5ac4dc SHA-1: c6d1d787f54eb6c497af6320a98ba9f950eeaf2b SHA-256: f919e57b55881cf7d5b1cfcf192e7983f3089f5e3b93bdc05f8d28fa1fc7d96f
186 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 0.9997

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://crysiq.ru/pbw?utm_term=what%2527s+the+roblox+id+for+roxanne PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494674/normal_5ff90cd9a0112.pdfIn PDF document text
    • https://misefumod.weebly.com/uploads/1/3/2/6/132680918/kawareserobu.pdfIn PDF document text
    • https://poxunafit.weebly.com/uploads/1/3/5/3/135330231/773365b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_60111d0533835.pdfIn PDF document text
    • https://laxigotugib.weebly.com/uploads/1/3/0/9/130969680/ladem.pdfIn PDF document text
    • https://bonizilolalov.weebly.com/uploads/1/3/4/4/134458774/siwepiw.pdfIn PDF document text
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/7436428.pdfIn PDF document text
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/cee9b6e32.pdfIn PDF document text
    • https://gozerivolese.weebly.com/uploads/1/3/4/2/134265833/sabavog_sanowokif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_6016b39eda417.pdfIn PDF document text
    • https://jipagulus.weebly.com/uploads/1/3/1/3/131379543/dumaxedoru.pdfIn PDF document text
    • https://fonutupo.weebly.com/uploads/1/3/4/7/134727000/narolagofanadep-tesawozuluwod-gotanumo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fetinaduv.pbworks.com/f/zevabidakoxomusi.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/w/file/fetch/144605379/jopiwaxujatularokuv.pdfIn PDF document text
    • http://refarumiba.pbworks.com/f/tigunekitaxutik.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/w/file/fetch/144529221/madrasrockers_2018_tamil_movie_download.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/f/the_little_seagull_handbook_with_exercises_4th_edition.pdfIn PDF document text
    • http://genarozep.pbworks.com/w/file/fetch/144502740/how_to_apply_for_ignou_bcom_af_certificate.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/w/file/fetch/144427899/bombsquad_pro_pack_mod_apk.pdfIn PDF document text
    • http://jopamedet.pbworks.com/f/how_much_can_a_ford_ranger_tow.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/f/kamadasu.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_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 5252 bytes
SHA-256: 77fc977c9a26e27ef88c88555b39356a6d22e35f149569b6f77d1204ebd79c27
font_01_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 10740 bytes
SHA-256: c9f760b9d1861668c7a164cfd1c9753019056fbcfbd24a06770179f309c33e64

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