Malicious PDF — malware analysis report

Static analysis result for SHA-256 079b0f54451f330e…

MALICIOUS

PDF

73.1 KB Created: 2021-03-18 16:33:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f2c516b951d457fb2ed19d60957fbf54 SHA-1: 2873e9700789b36633cb8ef4aae83c7ea150035c SHA-256: 079b0f54451f330e4b320c987fa7ac7d8d83c9225b9f28bca9f94c3325be1ac3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or to download further malware. The document body content is heavily obfuscated and unreadable.

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://xajibur.ru/wix?keyword=point+slope+word+problems+worksheet PDF link annotation
    • https://cdn.sqhk.co/leredupodeka/iaywttY/2471198908.pdfIn PDF document text
    • https://dogonojibot.weebly.com/uploads/1/3/1/6/131606640/xezamaxagetima-lunezawapab-vefajokatetesab.pdfIn PDF document text
    • https://cdn.sqhk.co/sofilita/khfiMxk/photo_studio_pro_software_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/eijhfKz/jafakivusenuwopujo.pdfIn PDF document text
    • https://voxepobar.weebly.com/uploads/1/3/4/6/134668427/3fedf91d4e9092.pdfIn PDF document text
    • https://wirorovikematu.weebly.com/uploads/1/3/1/0/131071137/2d73f39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_603f9cb17ba87.pdfIn PDF document text
    • http://instasale.company/what_are_boundary_conditions_in_earths_climate_systemsnbyl.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/hjWVU3X/lomifu.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/9LTXgc1/sotosikabavewebomupasikez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_602dfead5d16f.pdfIn PDF document text
    • http://noksipals.online/ccrn_study_guide_freetgogw.pdfIn PDF document text
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/1677868.pdfIn PDF document text
    • http://tehnotop.store/beriacroft_chrome_androidkbrg0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5fdc1e87012ae.pdfIn PDF document text
    • http://ledy66.net/amazing_grace_classical_guitarfc7nw.pdfIn PDF document text
    • http://grenkasalo4.xyz/doneduxabobazwfdtr.pdfIn PDF document text
    • https://cdn.sqhk.co/luluzefob/dhfibij/cafe_de_flore_soundtrack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_6c52704143b647b183b5ba77339da7fb.pdf?index=trueIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_8e0080f94911482b8254aa9fa63ff6d5.pdf?index=trueIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_acf9fe4e965649d3a1efdbecd7c6fdc8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 5288 bytes
SHA-256: c7d8a54127c8b7202d0bb20bff891aadcbc12ae8b1d16c76b0a31a035b499e0f
font_01_sfnt_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 10396 bytes
SHA-256: e504bc826926ca8fa479a49034184c1ffcf2020d9ce528001ebde36d7f6a2d27