Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4fc7fefaaca594…

MALICIOUS

PDF

79.9 KB Created: 2021-02-28 13:24:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4561e5e51a42d376afb75e85987e2fc1 SHA-1: 5bf199bdc674fa3acc13191982e79ae6e8f81872 SHA-256: fa4fc7fefaaca59452b6b2fcd0402f1c18e74a65b88aeb216a5f8ac593050d8a
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it's a PDF generated by wkhtmltopdf, likely to disguise its malicious intent. The primary attack pattern involves tricking users into clicking these links, leading them to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://fokemale.ru/123?utm_term=michael+crichton+movies+streaming PDF link annotation
    • https://cdn.sqhk.co/posojuvapono/awfjhvW/manga_clash_warrior_arena_characters.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/how_to_connect_philips_bluetooth_stereo_headphones.pdfIn PDF document text
    • http://posuvukapimufes.iblogger.org/amour_sucre_episode_23_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/giheNhf/zirunikojowigosokaminunax.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/jobezemapobaresuzuje.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/what_is_the_power_of_a_power_property.pdfIn PDF document text
    • http://lifeeuro.info/7194168032213ke2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_60265b21cc696.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satawakerexe.atwebpages.com/xawibejipadelefuguj.pdfIn PDF document text
    • http://leximadibiwojid.epizy.com/7344686669.pdfIn PDF document text
    • http://wapemufabaloni.rf.gd/19459530161.pdfIn PDF document text
    • http://jesebikalag.epizy.com/rimabisemerusibuzetigim.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/87347782144.pdfIn PDF document text
    • http://zuvuzevo.atwebpages.com/anglo_saxon_poetry_the_wife_lament.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_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 5276 bytes
SHA-256: 93240e8f1a1b24171b60996315d07bc81f0aaf5c0fcbc76321e1bdceebe7cbd4
font_01_sfnt_off00010e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2D 10632 bytes
SHA-256: e2275f9701871e9bdc8338fbfc3dad43112527aba79a12d565cd69b205dcaf38

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