Malicious PDF — malware analysis report

Static analysis result for SHA-256 86af74ce52103225…

MALICIOUS

PDF

79.4 KB Created: 2021-04-21 06:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 27c6bad5e4dd6983e8b824525975b2ff SHA-1: 688cd0d16ae303254465d31455c3847a25013a28 SHA-256: 86af74ce52103225482d1dfc24c3885c46515d7107b2e712ad1a2d2293267b84
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous external URLs that likely lead to malicious sites. The heuristic firings indicate a high probability of phishing and malicious intent, with the ML classifier outputting a score of 0.999574. The document body, though heavily obfuscated, appears to be a lure related to 'how to use a presto deep fryer', suggesting a deceptive pretext for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=how+to+use+a+presto+deep+fryer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415065/normal_6061947f8bfe7.pdfIn PDF document text
    • https://nidexopike.weebly.com/uploads/1/3/1/4/131407316/tugem-rinaretenazi-gamalepavo-wozesas.pdfIn PDF document text
    • https://xovazarorofo.weebly.com/uploads/1/3/4/4/134457653/783b50e7caa5.pdfIn PDF document text
    • https://witojezig.weebly.com/uploads/1/3/0/7/130776148/762d9f4.pdfIn PDF document text
    • http://jerikedora.iblogger.org/bsc_1st_year_physics_textbook.pdfIn PDF document text
    • https://fapurexetekuwud.weebly.com/uploads/1/3/4/5/134508670/padizatoxumeki.pdfIn PDF document text
    • http://sesosorav.iblogger.org/25237420144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476601/normal_602d8a9b812af.pdfIn PDF document text
    • https://wilalunawotepa.weebly.com/uploads/1/3/4/6/134608105/cff070ea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_604d2f3aacace.pdfIn PDF document text
    • https://xufolonul.weebly.com/uploads/1/3/2/6/132695880/pilexebozuxagi.pdfIn PDF document text
    • http://rekalotalixug.iblogger.org/lotubafusorifu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lagawutek.epizy.com/21414912738.pdfIn PDF document text
    • http://gedawov.epizy.com/what_should_i_set_my_fridge_and_freezer_to.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e67ec73-b07a-40af-a1ab-2882dc6a1292/54454843427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca48e7af-7e71-4633-85e2-a8b7c0ef221b/pulafowex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a14625d-617e-49b7-9eda-6cd8ae2e8d9b/set_time_citizen_eco_drive_watch_wr200.pdfIn PDF document text
    • http://wisalawisavu.epizy.com/american_journal_of_clinical_pathology_case_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64fb0e2e-2493-40e5-a2be-905fc02a1826/the_history_of_the_navy_of_the_united_states_of_america.pdfIn PDF document text
    • http://libizutuxe.rf.gd/zasen.pdfIn PDF document text
    • http://bufizufidubak.rf.gd/cognizant_aptitude_questions_and_answers.pdfIn PDF document text
    • http://falivodekolulo.epizy.com/53090123493.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_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 5160 bytes
SHA-256: e9cc6b5e8ded63d2acdcc34d623617ca1a72fd79c1e336805a96d161a97f11f8
font_01_sfnt_off00010aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 10380 bytes
SHA-256: ef9152ac9984ecaafe3416832d04ddd25052e8ec44aba9ed496065a8dc28d363