Malicious PDF — malware analysis report

Static analysis result for SHA-256 87993401d7c3d2f0…

MALICIOUS

PDF

81.6 KB Created: 2021-05-11 01:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 13a1c08676804fe933dd9c400e14754d SHA-1: 83a906eaaa5c50afef928809cc7ac0a20530972b SHA-256: 87993401d7c3d2f01505e60da3759e2979cb4971414c8f8bd1a4bca192bee21e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=craftsman+miter+saw+stand+22304+manual PDF link annotation
    • https://cdn.sqhk.co/wexovezojab/jc4jejb/nojemuzevagaxafere.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/e1bbf9843e.pdfIn PDF document text
    • https://cdn.sqhk.co/kofatuziwu/hjjeiex/16332906327.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/hgiehhj/prodigy_math_game_toys_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/qYfZgjB/pinkfong_baby_shark_listen.pdfIn PDF document text
    • https://cdn.sqhk.co/zipedufipiz/ijQhijh/ebay_kleinanzeigen_for_germany_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rewanizotaj/icFcigP/cute_polar_bear_wallpapers.pdfIn PDF document text
    • https://risebezisenozo.weebly.com/uploads/1/3/4/3/134375164/3370142.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/3Rjhggp/9406842052.pdfIn PDF document text
    • http://birojinemudix.iblogger.org/writing_arabic_alphabet_worksheets.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/0c981d09.pdfIn PDF document text
    • https://cdn.sqhk.co/wowubumopem/ggMjgFX/xumezimisesudeluzasokutop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jofarasaxorepow.rf.gd/how_to_start_gym_as_a_beginner.pdfIn PDF document text
    • http://biverak.epizy.com/crowds_and_power_elias_canetti_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/rivasawunol.pdfIn PDF document text
    • http://novosumagib.epizy.com/dugusewisoz.pdfIn PDF document text
    • http://jituriz.epizy.com/gastroenteritis_viral_adultos.pdfIn PDF document text
    • http://jiguteduvuvuxa.rf.gd/lasojibuvuwevidipagagafuz.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/volipelivegejiged.pdfIn PDF document text
    • http://repudazuvokidef.epizy.com/define_ethnocentrism.pdfIn PDF document text
    • http://fobufalezax.epizy.com/alkalosis_metabolik_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/what_does_606_mean_urban_dictionary.pdfIn PDF document text
    • http://dupepasanu.epizy.com/writing_sample_for_job_application_example.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/crepe_paper_flower_templates_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 5468 bytes
SHA-256: 3e13563da204a5518914f317526b97c524f239de9f2c652999650a59f1695e74
font_01_sfnt_off00010455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10455 11728 bytes
SHA-256: bdb35710ebf69c67d63ccc8f5868226df5fdb6d3d32610a174433640cb2b8237
font_02_sfnt_off00012bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3