Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05a9b8ea7586826…

MALICIOUS

PDF

77.5 KB Created: 2021-02-10 04:13:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 58989d998ed106e538e42c31a4ec77d6 SHA-1: 36b5c168c83022b22dcaf12704b98c673f389df2 SHA-256: b05a9b8ea7586826d493abecb9a9dacff44968e09b2171ab7c3d2d04b7eff940
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the PDF heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/aws?utm_term=arabic+text+generator PDF link annotation
    • https://cdn.sqhk.co/rifokinimito/XPgfEDZ/ravens_steelers_news.pdfIn PDF document text
    • http://tonerinkstore.com/60782461376gn9d.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/d3gfbhi/armello_dragon_clan_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/DjegfR2/resident_portal_customer_service_number.pdfIn PDF document text
    • https://valabokewem.weebly.com/uploads/1/3/5/3/135311070/naleporawiledagoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5fd901ab1c00f.pdfIn PDF document text
    • https://napuximijagebi.weebly.com/uploads/1/3/4/7/134766840/kivuvilije.pdfIn PDF document text
    • https://cdn.sqhk.co/pubisifibuj/sgjighe/parkour_goes_wrong.pdfIn PDF document text
    • https://begafirezudafo.weebly.com/uploads/1/3/1/4/131438667/3d6c7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5fe7a115ddd11.pdfIn PDF document text
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/febimi_revoliwozip.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/mubikemamobufovowaqhhi5.pdfIn PDF document text
    • https://cdn.sqhk.co/dakuwuwuzije/Olhg3ia/adversaries_definition_hunger_games.pdfIn PDF document text
    • https://cdn.sqhk.co/sulugedako/jkgihed/university_pet_clinic_tucson_arizona.pdfIn PDF document text
    • https://cdn.sqhk.co/xamizine/brNhMnX/94663149939.pdfIn PDF document text
    • https://cdn.sqhk.co/wekababu/LjgXdoD/cash_train_same_day_loans.pdfIn PDF document text
    • http://heartcenteredequestrian.com/tenezelaxodufasexipekipw4qxx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011019.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11019 17356 bytes
SHA-256: 058f4b4f62a75b5778e0e66ac2310b7199859de399e40925e380b83aeb71ddfb
font_00_sfnt_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 4956 bytes
SHA-256: a00fde5f2c955ad7779b8ac4a7a66e2998633e397f4997ac839f7092a99879b7
font_01_sfnt_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 11452 bytes
SHA-256: a71a200fac42673fde6e325f5750334a979b2ffd886224fe27177b5524fb9d92

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