Malicious PDF — malware analysis report

Static analysis result for SHA-256 f777f1951d1e54df…

MALICIOUS

PDF

71.9 KB Created: 2021-03-01 14:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 573a0801d485fcc2df9a1f966d559e8d SHA-1: 52c53f0c94da30477e0aace96b4f0983486ae1ba SHA-256: f777f1951d1e54df950777971d27b9498f848d097f21806eb8f86800c878481d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms designed to host malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous external URIs and a link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/wix?keyword=corn+snake+feeding+chart PDF link annotation
    • http://requiredjokblog.com/2964672673wwzxx.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/hgeNjga/science_channel_go_directv_now.pdfIn PDF document text
    • http://bigmagazin.xyz/liputelinepitqgey1.pdfIn PDF document text
    • https://jorojesa.weebly.com/uploads/1/3/4/8/134861508/8552167.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413474/normal_60040fbc18643.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/dinofifaditufuru.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/jagfgee/96004223037.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/ikea_augmented_reality_furniture_cataloguezoiek.pdfIn PDF document text
    • https://cdn.sqhk.co/febutatesu/dDheVij/radio_en_vivo_mexico_noticias.pdfIn PDF document text
    • https://cdn.sqhk.co/bitulore/ifma6jx/vugato.pdfIn PDF document text
    • https://cdn.sqhk.co/dovinokobez/aOhgKib/space_bowling_pori_aukioloajat.pdfIn PDF document text
    • http://safagiko.iblogger.org/sun_and_planet_gear.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382614/normal_5fcd3d2769918.pdfIn PDF document text
    • http://bitcoins-profits.com/how_to_install_coffered_ceilingbxwvk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408481/normal_6031bbd07f4db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://legofebufulemo.rf.gd/rscit_application_form.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_off0000de21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE21 5220 bytes
SHA-256: cd17da7d2fab52a5804509d4325fbb44454397e14bb2da6cacc45d84456ba677
font_01_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 10240 bytes
SHA-256: c1ec0eae0a8cd07561758b08e268390ab40da48af18d0a9567e19768e12a37e1

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