Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f6f7bb1c23e41e…

MALICIOUS

PDF

142.2 KB Created: 2021-04-04 11:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b9fd1acd91fcd058077271eb3a4ad7f6 SHA-1: c93613ca8d41dfd3178e680605108c3868ff8cc8 SHA-256: 79f6f7bb1c23e41e8a687bbf4a81483d88a31bd4422e5951b656e651158f25c9
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs disguised as a dissertation report. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were directly extracted, the embedded URLs are the primary indicators of compromise, directing users to potentially harmful or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://jacksth.ru/123?utm_term=dissertation+project+report+pdf PDF link annotation
    • http://leledup.mypressonline.com/what_does_the_term_strength_of_character_mean.pdfIn PDF document text
    • http://tebafurunaxinuj.getenjoyment.net/88049212286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424637/normal_6019bbe4a82ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377408/normal_5fe1694d2bcb7.pdfIn PDF document text
    • http://sewatumafuta.medianewsonline.com/ingenuity_inlighten_baby_swing_reviews.pdfIn PDF document text
    • http://tolumobibuseg.iblogger.org/88465287983.pdfIn PDF document text
    • http://kimagibasip.22web.org/waxofedejunerudajenod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449001/normal_60205ebc16c9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5fd10eaad38cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456399/normal_600d9a69579b3.pdfIn PDF document text
    • http://rujewazaxijaza.sportsontheweb.net/functional_programming_in_scala_martin_odersky.pdfIn PDF document text
    • http://nunovoxiwanafuz.getenjoyment.net/nuwexupajoroviwedoken.pdfIn PDF document text
    • http://womovenum.sportsontheweb.net/torewosokazozebizovin.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_9b589b4da34e4d31a5c5f8a0cab9a043.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_fb6a33936e074969ad9d7068ccfabe5e.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_84dfe81c3b2b4d79a4efccb7744ed07d.pdf?index=trueIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/xizudajujidasizufubasora.pdfIn PDF document text
    • http://nivobilov.epizy.com/did_the_ussr_have_a_constitution.pdfIn PDF document text
    • https://da25564d-e3c2-4b9b-87ba-dd8ce2ae78d4.filesusr.com/ugd/c82cd6_f164811cf96c4eb984ab9c28069a9ed0.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_dbb1de2064f84367adf5ae22325df852.pdf?index=trueIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_abed0fd753ce4dc09fce4dc52ba4f4f0.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_213acae3475043d1b2310f7d3543dc06.pdf?index=trueIn PDF document text
    • http://xuwugufufokiti.epizy.com/bepamof.pdfIn PDF document text
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_d2dc474dcf8848b48211565c1741f816.pdf?index=trueIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_e7b9f771454d40729696fa98101e0b0a.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_off0001e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E779 1696 bytes
SHA-256: a63dc7203ceba2031beaf1d50b83973ffdd0483474384fa5780efc3deacec6ca
font_01_sfnt_off0001efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFA3 5192 bytes
SHA-256: 2b8d4a49074225740845dbb404f3413ef0515db9a183e5e21195075070ae61df
font_02_sfnt_off00020164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20164 11640 bytes
SHA-256: 2ea6792a0ce8a88670d552116b32d5fe276703d297cf0f0000f983d5a7e3005e