Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fd74fc7ff3dbd4…

MALICIOUS

PDF

78.6 KB Created: 2021-04-11 10:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8470c6a9de8452225e8dcef039b9c34d SHA-1: c480c271a511972ca16cd7c3da74218e060b104e SHA-256: a9fd74fc7ff3dbd404b8a8c82ffde2b629bb9e4a3127579260dc12cd7e057380
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often leverage embedded JavaScript for redirection.

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://midufefew.ru/strik?utm_term=what+is+social+thinking
    • https://static.s123-cdn-static.com/uploads/4478141/normal_5feed7c2323bf.pdf
    • http://fofakowusagafo.22web.org/enhancement_shaman_classic_gear_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4485010/normal_600f8aeda2746.pdf
    • https://waretufiwad.weebly.com/uploads/1/3/4/5/134581883/3789811.pdf
    • https://binikefesomeb.weebly.com/uploads/1/3/5/3/135386190/4781043.pdf
    • http://wonozudobitisog.scienceontheweb.net/5473263320.pdf
    • https://firikanafumofud.weebly.com/uploads/1/3/0/9/130969048/vusetumigagoxovo.pdf
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/xowuwa_pewel_ropamezajagov.pdf
    • http://silujokiz.mypressonline.com/volkswagen_beetle_history.pdf
    • https://cdn-cms.f-static.net/uploads/4464539/normal_601ccfd3e98a3.pdf
    • http://goguduve.iblogger.org/rixoreximifopo.pdf
    • https://gaxatibixowoki.weebly.com/uploads/1/3/1/4/131452935/a06b065e5804.pdf
    • https://static.s123-cdn-static.com/uploads/4373526/normal_5fdebaea1e125.pdf
    • http://dokojekiferej.mygamesonline.org/kopelabilegajoxujefolovew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://satekivu.rf.gd/top_social_media_platforms_2019_statistics.pdf
    • http://muxajetolalet.epizy.com/secondary_limiting_voltage_current_transformer.pdf
    • http://donijexufenu.onlinewebshop.net/dizosemutezes.pdf
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_0e4a4b93d9fa4a4ebea1c8350a20d8af.pdf?index=true
    • http://gevejonitu.onlinewebshop.net/what_is_the_longest_big_nate_book.pdf
    • http://xepatodop.onlinewebshop.net/arby_s_nutrition_facts.pdf
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_1ed1049348c8467489a28e868fedd5ba.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f649.bin
8910b8c2a9d975a18bf418d10e165f1f248598c062a6f3de9e014a19bd5fb068		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 5040 bytes
font_01_sfnt_off0001077f.bin
35158e8c5a4bec12e0a408409fb725d0c3552aee1fe932095952289b85f19af3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 11072 bytes

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