Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bf99d669693a95…

MALICIOUS

PDF

92.8 KB Created: 2021-03-22 04:02:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 08856055be139416b26253805796c9ec SHA-1: b4aece002e44e099f94659b29e5345b4bfeacd7d SHA-256: d6bf99d669693a9583b6f4c538e8ded2265391bc11be70d7349c2f5c77830905
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content. The document body is heavily obfuscated and appears to be a lure related to 'pharmacology of antiepileptic drugs pdf'. No scripts were extracted, but the presence of numerous external links points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/award?keyword=pharmacology+of+antiepileptic+drugs+pdf PDF link annotation
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/muretopujarane.pdfIn PDF document text
    • https://gizomedapirev.weebly.com/uploads/1/3/1/4/131454265/1724115.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5fc7fea436eda.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/john_deere_567_baler_monitor_for_sale2d18a.pdfIn PDF document text
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/b8bb146489a8cc5.pdfIn PDF document text
    • http://viwizuzul.iblogger.org/sijesu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5fccbc73a19f5.pdfIn PDF document text
    • http://securityverifiedservices.com/que_significa_tener_anticuerpos_del_covid2s9n1.pdfIn PDF document text
    • https://bazanepuxakelu.weebly.com/uploads/1/3/4/3/134346533/6522157.pdfIn PDF document text
    • http://fb-ig-violation.com/2047443482838jhh.pdfIn PDF document text
    • http://lorem.space/zinusufogyx2rh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_60352d17c58d5.pdfIn PDF document text
    • https://rikekipodoze.weebly.com/uploads/1/3/0/7/130776447/7192565.pdfIn PDF document text
    • http://mamontov-net.cc/how_to_inspect_a_new_construction_homeuwpm4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467287/normal_5fefee4770512.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fibafewupo.epizy.com/zijogaf.pdfIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_9529a4f0274c4992ae93c4e8fad01b4d.pdf?index=trueIn PDF document text
    • http://wajatapewob.rf.gd/worowil.pdfIn PDF document text
    • http://rituruve.epizy.com/nufopexuvemuwuf.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_7c6c567cb66a404fa8201a3c5b63c167.pdf?index=trueIn PDF document text
    • http://bekogufepe.rf.gd/lowes_kobalt_air_compressor_sale.pdfIn PDF document text
    • http://jawomav.rf.gd/28644708669.pdfIn PDF document text
    • http://furaxem.rf.gd/71288866470.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_off00012ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA4 5672 bytes
SHA-256: b4c4173f8577aefe7d751a7462c15449f4fe7d2e8c9e5b634ae9fca2daf4ad90
font_01_sfnt_off000141d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D2 10528 bytes
SHA-256: 651f30c9cf94dbe806db71d64e6d816b92efc651088f3402eae9ced0be5568b9