Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f73eed22f05de08…

MALICIOUS

PDF

74.7 KB Created: 2021-03-28 04:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a9e976d884845841e7d475c92e8a367f SHA-1: 6ed20f0c0fb761fa4bf4f3f5889de67888aa1ea2 SHA-256: 6f73eed22f05de08bea9c9aaaaffec58068d732deb46ec143704361eb7418cea
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://xezojetit.ru/strik. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=how+much+do+technical+writers+charge+per+hour PDF link annotation
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/xogudevuz-jugosake-lisatavoz.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/dobajaw-guzonuwur-wixavowul.pdfIn PDF document text
    • http://islandlandscapesbb.com/android_colornote_master_password99pk3.pdfIn PDF document text
    • https://raxumizagava.weebly.com/uploads/1/3/4/7/134710615/396a426.pdfIn PDF document text
    • http://sodaapp.club/wejisanuwixerubiwid66vqh.pdfIn PDF document text
    • https://pomaxobizo.weebly.com/uploads/1/3/1/1/131163853/09624f9f4121b9f.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/jvc_kd-s39_wattsz6jw2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/6617415460.pdfIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_145d4b2a4b45402d89138aa89c1639ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/wofefonadulepunifal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e45d57-9f3c-4844-972a-67a8f4fa5140/sebulogetokubak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a05e714f-5d8d-4dd3-b379-c5e505f4053b/kanamupunal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d5daa5-9334-4e0b-9ca7-a56fbc81314d/85019861739.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_159c89fd86f140e9bd2bd096a4948ddd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1372cf1-6223-46c9-a419-8314dc14964c/47984278980.pdfIn PDF document text
    • http://fikafam.rf.gd/how_to_activate_att_velocity_usb_stick.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_997809a8446646739f046ecbc16352f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wezukep/what_is_the_role_of_religion_in_our_modern_society.pdfIn PDF document text
    • http://dadodoserosif.epizy.com/89103731531.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_be997a12e95844b0b5665fb08b625c46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votawawo/do_ethers_have_hydrogen_bonding.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_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 5540 bytes
SHA-256: 3bc2842176ab2c970eb266b33ebb5473e3dfb19f9a4dcd4c56a2d1777d34497b
font_01_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 11064 bytes
SHA-256: 95f663ae0682b9daf7c1e975fbcf1ba04988ec058a534b6799689fc1e3b3320e