Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acea381d8de4b33…

MALICIOUS

PDF

74.3 KB Created: 2021-04-02 15:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78c35533ec4e2ce928ba06cf9996e6ac SHA-1: d31a1a4dcdd7157f408982b426553bb6523e0bec SHA-256: 3acea381d8de4b33c90c7ea844bf7836617ee84107f15a851bce015d07e66479
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=thomas+dale+high+school+yearbook
    • https://rofuvawe.weebly.com/uploads/1/3/4/3/134363923/5959529.pdf
    • https://cdn.sqhk.co/vitimosugu/jFVVjhY/wovidagabuzotukuwox.pdf
    • https://cdn.sqhk.co/zuxedanafowa/gfghh5g/73075053605.pdf
    • https://naviguxiva.weebly.com/uploads/1/3/4/2/134266723/3f66a33a45f.pdf
    • http://bukipumil.mypressonline.com/3ds_max_architecture_tutorials_free_download.pdf
    • http://lizakoku.22web.org/73219718259.pdf
    • http://gukivuzijisuva.getenjoyment.net/87785634879.pdf
    • https://betebawaxudu.weebly.com/uploads/1/3/5/3/135388356/tenibijojaxadukeviba.pdf
    • https://cdn.sqhk.co/potiribuwuf/ggduge2/10836949116.pdf
    • https://jijixedo.weebly.com/uploads/1/3/1/3/131398351/8001899.pdf
    • http://bewewafip.scienceontheweb.net/the_killing_joke_ending_batgirl.pdf
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/kogulexutopot_vobusekozasefuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/21f91f69-d3eb-432a-a7c1-177d37de9e2b/8167449744.pdf
    • https://uploads.strikinglycdn.com/files/f7a4012b-d775-4fe9-a2ab-084576de069e/adh_disorders_hypo_and_hypersecretion.pdf
    • http://lalepimesizi.epizy.com/nalufoteribime.pdf
    • https://uploads.strikinglycdn.com/files/f5db395f-5efe-4177-aece-917bef45d2f5/jolibanetigafepufagenemut.pdf
    • https://uploads.strikinglycdn.com/files/e1068cd2-2f5b-4154-af34-8d0ca8d0ffeb/larutivumavugo.pdf
    • http://tuxowisinaxug.rf.gd/30561220573.pdf
    • http://sojusenetuki.onlinewebshop.net/72757888906.pdf
    • http://datavofunuta.epizy.com/gatelutokaxen.pdf
    • https://uploads.strikinglycdn.com/files/5e0eb745-282b-4488-88e7-b984d1825428/rukafizimapuwazajekavut.pdf
    • https://uploads.strikinglycdn.com/files/2afa06ae-c4a2-4781-a2df-235c343b794f/how_do_you_know_you_feel_love.pdf
    • https://uploads.strikinglycdn.com/files/eddb5141-764d-47ad-8921-01c6546142fa/army_field_sanitation_kit_contents.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e37d.bin
f8115f813e4ef4c009369fb30a5afc6700b6b4aa1de3dd47f97141123c1cb1f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 5608 bytes
font_01_sfnt_off0000f669.bin
ffae3fad81699a2d73cdd2b563d51f874007fd75cb16982844e1310bd4d54c9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 10816 bytes

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