Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39875772b29ae0d…

MALICIOUS

PDF

83.8 KB Created: 2021-03-23 11:59:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5483d10923417809db7e2d73417a9f15 SHA-1: e017ee8cb1755d4810fa95812e2bf2805588cc08 SHA-256: f39875772b29ae0df90a5f16ce0b7d11d408d9c3a92f30a710e3977db665ce9b
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to direct users to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://dugedepap.ru/award?keyword=bpsc+syllabus+2020+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415782/normal_5fc793c02006a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_6017acd7dbc46.pdfIn PDF document text
    • https://nalebetiraj.weebly.com/uploads/1/3/4/6/134669494/8636403.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/0d4867c056e.pdfIn PDF document text
    • http://roxobupupop.22web.org/helplessly_song_pagalworld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488339/normal_602c69a2cba17.pdfIn PDF document text
    • https://jigaxokere.weebly.com/uploads/1/3/4/6/134622899/f0891c57be55fd7.pdfIn PDF document text
    • https://tevaxuxelajuri.weebly.com/uploads/1/3/2/7/132712575/8709494.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5fc9cd97d98ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://penisidisipifo.rf.gd/how_much_does_a_toto_toilet_cost.pdfIn PDF document text
    • http://dogazuzi.epizy.com/73574264427.pdfIn PDF document text
    • http://ratesedefavure.epizy.com/dental_cementum.pdfIn PDF document text
    • http://posugez.epizy.com/penyakit_botulism.pdfIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_15208e517f7a468da6b76b670815eaf0.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_6cc22c2b160c465aac35a57a04bf6575.pdf?index=trueIn PDF document text
    • https://67389751-14cc-4ed3-b660-7ef7239e4cc3.filesusr.com/ugd/bb5584_54dc08adffeb499b9005b10c16aeeef5.pdf?index=trueIn PDF document text
    • http://lavukef.epizy.com/somoxejawuji.pdfIn PDF document text
    • http://bekujefil.epizy.com/happy_endings_sticky_fingers_meaning.pdfIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_4065a2c946164ffcbcb64f4f0196a659.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_0827ffd9446d42f49f317616632c84cd.pdf?index=trueIn PDF document text
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_12df71cda2834d798c9d25d6a21d5e4e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 5616 bytes
SHA-256: fe1980199c17378006531dac8a0d33fb007ea14cda7870df56b2787a5b397e24
font_01_sfnt_off000109b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B4 10824 bytes
SHA-256: 2caa8b0c2cf4506c244e8b0639e35d2dd270fa3ba16362eb94a6d98bf5c6575c
font_02_sfnt_off00012eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 5316 bytes
SHA-256: 388136527b622b9e0eb7346802e3b84c191e42b49885e6b3ec042df84634430c