Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33fa1d52d858331…

MALICIOUS

PDF

76.6 KB Created: 2021-03-22 16:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 30dcbb7cbfc4810d96233463a16d915c SHA-1: 20d194cc08a16f88548664b2b1526f9daacc0b38 SHA-256: a33fa1d52d8583316f996dd83b59ebbbe3731eb97506319f56c0af0dd8d85a77
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many on disposable hosting, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'Apollo twin driver update', a common lure for technical support scams or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=apollo+twin+driver+update PDF link annotation
    • http://devicesprotectionforusers.site/ffxiv_treasure_mapsg69rs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401555/normal_5ff53f84c58c3.pdfIn PDF document text
    • http://azalea.store/do_fish_crossbreed69bk1.pdfIn PDF document text
    • http://begdas.space/lugabofefuvisunoporin9jl2.pdfIn PDF document text
    • https://wanuzixa.weebly.com/uploads/1/3/1/4/131482886/5354572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_601bc0eb9a1f1.pdfIn PDF document text
    • http://theharaka.online/652615879599qzh.pdfIn PDF document text
    • http://buybritishcat.com/how_long_does_it_take_to_get_certified_in_autocadivx1x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393485/normal_600d0924c881a.pdfIn PDF document text
    • http://crispyset.online/35947206618cj8a2.pdfIn PDF document text
    • http://blacktea.space/plane_controls_pc_gta_5j4elf.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/9c45d64d2a.pdfIn PDF document text
    • https://mobuverafawez.weebly.com/uploads/1/3/5/3/135346795/namopebib.pdfIn PDF document text
    • http://ctyr.ru/66778003162w7aob.pdfIn PDF document text
    • https://setowunujabid.weebly.com/uploads/1/3/4/0/134095848/nunegosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_60382537bd0af.pdfIn PDF document text
    • http://veronaital.space/92386354010p0jri.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/zagubip/24338553358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d98c55d-8ae4-456b-a71f-f123dccbb3e4/fatikuwedivupozo.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/niwem.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/gold_medal_popcorn_machine_model_2404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/275f127b-48a0-4a15-b0c5-98be11cbbd78/how_to_light_up_a_furnace_in_minecraft.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_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 4916 bytes
SHA-256: 35758fea1a7239ce5c6bf2202bc51e7a6134e3152d4c6528a3e44222ab275775
font_01_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 11120 bytes
SHA-256: 7c9fa489c3c223f7fdd9e2b09ead4db1f7fbc0085e69b949a32ec37577a79124

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