Malicious PDF — malware analysis report

Static analysis result for SHA-256 148e5c1aa870acc1…

MALICIOUS

PDF

107.2 KB Created: 2021-05-29 13:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8dd301fda07db66d382790247de92b20 SHA-1: c2ccfc94056a965aa7e2df16191116d271ebf8ce SHA-256: 148e5c1aa870acc19bcaa705123208fbbb046cbea5d3519b362ba1cd1d6bf888
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 designed to distribute malware or phish users. The primary URL, fokemale.ru, is likely a distribution point for malicious content. ClamAV and ML classifiers confirm the malicious nature of the PDF.

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://fokemale.ru/strik?utm_term=paul+tillich+systematic+theology+volume+1+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368238/normal_603eac84d45ce.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/2997161.pdfIn PDF document text
    • https://zutofamofiselas.weebly.com/uploads/1/3/4/0/134040676/lanidotodar.pdfIn PDF document text
    • https://lalojitewimagix.weebly.com/uploads/1/3/5/3/135304200/6555497.pdfIn PDF document text
    • https://dijitisabotiji.weebly.com/uploads/1/3/5/3/135324222/mudix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_602cdedd4d68b.pdfIn PDF document text
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/44e79c28174.pdfIn PDF document text
    • https://nimosawi.weebly.com/uploads/1/3/5/9/135982357/buzuregomij_texajod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_6025b5d6d3d88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_605db85894767.pdfIn PDF document text
    • https://gulufoge.weebly.com/uploads/1/3/0/7/130776817/numixabubadulov_vipamiwasig_rukiwatomo_saruf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_605b5c25d36a0.pdfIn PDF document text
    • https://gizajosusu.weebly.com/uploads/1/3/1/8/131856374/jokuwiwu.pdfIn PDF document text
    • https://lodarexuxune.weebly.com/uploads/1/3/4/3/134352809/9991757.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423195/normal_600614f02e147.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c101b9d4-55b2-4524-8dc2-ecb1e7fed18e/gimukazevekudadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef52e84a-ee73-47ea-926a-348d3a9e6977/lepegeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa744bbf-901a-4c35-80e6-11b01821bf75/kawasaki_bayou_250_starter_circuit_relay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef7a386-7fbb-4b02-b650-5ec30715cca9/30720841267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede11a22-2131-4f2f-9ff9-a4bde7f21ba8/modal_verbs_examples_shall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f949af5-3234-418e-bef3-bed7c7e8efe2/lewezixukodelinuzosubuxed.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000158a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A1 5464 bytes
SHA-256: d25686636f4b4d84697951041cea3a46f832a46bb1bb89f6c226d9450d1cbb93
font_01_sfnt_off00016b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B58 11172 bytes
SHA-256: 2ddebb3c43be63ad4d2c44afcd27c0b4e0a086ef1d60cb6b454f22a64f0efe30
font_02_sfnt_off0001914b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1914B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71