Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e861ab54623cff…

MALICIOUS

PDF

73.4 KB Created: 2021-03-16 00:03:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 319462c490b36db88e07c573225a9518 SHA-1: d1a876206f52a3e7b40135e3a192f1084d7047ca SHA-256: d7e861ab54623cff63ba1ea95011ff21f7abdde518acfcf7abf5a3f72af4679b
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are characteristic of phishing lures or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://golowaki.ru/award?keyword=meralgia+paraesthetica+nhs+pdf PDF link annotation
    • https://cdn.sqhk.co/wevodapobu/jVjjshh/30898612437.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/vatutasibenegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465144/normal_60171df39c357.pdfIn PDF document text
    • http://vajesafosedepur.mywebcommunity.org/solid_and_liquid_propellant_rocket_engines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_6007a5f9a8b4d.pdfIn PDF document text
    • https://cdn.sqhk.co/juselivo/aZRlEYS/86175294980.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367007/normal_5fe1a21b44f80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_6044f1e2dd08f.pdfIn PDF document text
    • https://topipanonotege.weebly.com/uploads/1/3/4/6/134679812/9e749130597b08.pdfIn PDF document text
    • https://cdn.sqhk.co/nusatabi/iapharm/bodoni_sans_display_font_free.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/h1jadjf/87197973194.pdfIn PDF document text
    • https://cdn.sqhk.co/ninevowa/J2wgchi/guia_ceneval_exani_ii_2019_contestada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482617/normal_5ffa5b1553d0d.pdfIn PDF document text
    • https://buwolerujagelav.weebly.com/uploads/1/3/4/5/134580081/1972275.pdfIn PDF document text
    • https://rijojuno.weebly.com/uploads/1/3/5/3/135310883/9258425.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/will_there_be_a_sequel_to_death_note_anime.pdfIn PDF document text
    • https://cdn.sqhk.co/gutemokerezo/EK5xjeP/milewadarusorufus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejimafalun.onlinewebshop.net/85414837421.pdfIn PDF document text
    • http://wudazebej.atwebpages.com/cambridge_english_empower_b2_download.pdfIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_a0cc4ffd27684254b68f2591d292ad8d.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_35fb1154c9974d7f9c53451a08d45767.pdf?index=trueIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_49d17ef6ca314aa981cd0f83b9cea50d.pdf?index=trueIn 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_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 5424 bytes
SHA-256: 8b3801d6d2e54aa4b246ffcec4ae490a547cbe444c052da2e42f111ecfefcd2c
font_01_sfnt_off0000f3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 10596 bytes
SHA-256: b4b97b925c45d636bfaffd6ee46d254e0f0dfe779b08e276c73718cacf9d8cba