Malicious PDF — malware analysis report

Static analysis result for SHA-256 d051f58c426a6320…

MALICIOUS

PDF

69.2 KB Created: 2021-04-06 02:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bfe3fb3fc4a7b04978c044939ae72ad4 SHA-1: a0a2fdb0bdcb93bf8a45e3005994224e15ec4e60 SHA-256: d051f58c426a6320bd95fae9c9ddc0a9090efb52a57a2b6762772e6cc316fc89
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF structure and embedded links suggest it's part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/wix?keyword=ken+tech+clock+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425760/normal_5ffa15e4b99c8.pdfIn PDF document text
    • http://hellesypakk.online/how_much_salt_a_day_bodybuildingggofz.pdfIn PDF document text
    • http://tranquils.space/gevalia_free_coffee_maker_deal2ys49.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/waxifunobuzodojosulitetig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_600ea54c2bdd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408583/normal_600352f084d1b.pdfIn PDF document text
    • http://straponartist.com/lunapuzade7v1w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487413/normal_6023cb4a2ad93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5fd05ffb417af.pdfIn PDF document text
    • http://zigamuko.iblogger.org/tulun.pdfIn PDF document text
    • http://palogaza.sportsontheweb.net/rukonofew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mizizasuz.epizy.com/how_to_use_the_critical_value_table.pdfIn PDF document text
    • http://bopubedoru.myartsonline.com/kanedemelewu.pdfIn PDF document text
    • http://kunopeto.epizy.com/zukogepazotuluxubuwup.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/danipevibimuxat.pdfIn PDF document text
    • http://sejineje.epizy.com/who_has_damon_salvatore_slept_with.pdfIn PDF document text
    • http://xamojivegubon.epizy.com/is_a_doll_house_feminist_or_humanist.pdfIn PDF document text
    • http://rigidafavubo.myartsonline.com/noferujovabatakilas.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/back_to_school_series_2.pdfIn PDF document text
    • http://bagobopog.rf.gd/bolero_slx_image.pdfIn PDF document text
    • http://wenulusevikofa.myartsonline.com/49463755674.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/waramaloro.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/novekukunili.pdfIn PDF document text
    • http://bobuvuj.rf.gd/megusomora.pdfIn PDF document text
    • http://kudinezajaw.rf.gd/rozofuvufebofosiveg.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_off0000d3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 4800 bytes
SHA-256: 79e4ce6b994daa2c912597911ef6874533d24710823c6be95dda2a334ddaa7cf
font_01_sfnt_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 10600 bytes
SHA-256: 8be071aa2d36551765aa3d4261a633e60642e2153298f9169657d32f1d7887f3

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