Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e863b45e81b260…

MALICIOUS

PDF

89.9 KB Created: 2021-05-11 23:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fe0a8be3a1195db5f43c6b49bbfdfe03 SHA-1: bb968d23605c5cf0e01a5cd1d91b26c38922658f SHA-256: a6e863b45e81b260584864d7a38771239ca1d436c96f7fc95dc2d7c4bbff4c87
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or redirecting to malicious sites. The document body, though partially garbled, contains a title related to 'remote starter' and a URL that aligns with this theme, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=how+to+reset+a+remote+starter PDF link annotation
    • http://rivokalodusi.sportsontheweb.net/the_economist_world_in_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zidadipam/ifgfvje/absurd_theatre.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/WLYhgja/9729620818.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/XhbifAb/sezesovuti.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/KnjbR3F/wedding_hair_and_makeup_nyc_cost.pdfIn PDF document text
    • http://duwefazef.22web.org/handbook_of_brick_masonry_construction.pdfIn PDF document text
    • https://cdn.sqhk.co/zisazege/2HijaNO/61350288304.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gejizejaniwijef.atwebpages.com/47645261621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/256df67d-8415-4d8a-af59-fb9015e081b2/97712308687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a6897c6-9140-4807-847d-466d10c1be3f/43949926236.pdfIn PDF document text
    • http://wuparol.epizy.com/tujaduviranirosutotamura.pdfIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_800ad06c309c4aa8a33a1cd14e0f9f9b.pdf?index=trueIn PDF document text
    • http://rulenanevatetid.epizy.com/gikefopiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5db7edb-0f8d-4d0c-9e02-a7554ac1e40f/pugixefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/235a1d59-c4f1-4ffc-9054-c3720967ad74/wave_power_plant_advantages_and_disadvantages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeb43a78-811e-485a-b636-aff56590cf17/which_greek_god_symbols.pdfIn PDF document text
    • http://fakeloj.rf.gd/57739878605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6264032a-8890-4ae1-b69b-76935e00c9aa/joy_to_the_world_chords_d_key.pdfIn PDF document text
    • https://9e084d23-5bbf-42ad-98e9-fa9200f8584e.filesusr.com/ugd/4f663b_0712c939b8254a83b48ce809ba8ae777.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa485aef-b19d-413b-8520-8f2a057655c7/how_to_remove_a_nutone_range_hood.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_off000122b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B5 4852 bytes
SHA-256: 2c0acf67276d70ac57ca8a9cdb48c7c3c6af06c33392d09487eb3a26fc143e7e
font_01_sfnt_off00013328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13328 11132 bytes
SHA-256: 4d6e3cfac04bb095872ddbd44940c9fe039746d5094b51d58fd298eb83d26ed4