Malicious PDF — malware analysis report

Static analysis result for SHA-256 731898a0584e8965…

MALICIOUS

PDF

74.5 KB Created: 2021-04-13 15:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5baf2d991b18a4be83f1d80309c3f42e SHA-1: 821ed7fe2b855c0d1726d82705030064a9a24252 SHA-256: 731898a0584e8965abcb06cc1d30bb939df9febdcdb2c5df6738d33f08d3d01a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://dafemum.ru/strik?utm_term=c+reference+static+variable PDF link annotation
    • https://fatibetoliwan.weebly.com/uploads/1/3/4/7/134731660/b5e8f6d581c.pdfIn PDF document text
    • https://variwigegepug.weebly.com/uploads/1/3/4/3/134348450/kapatakuzu.pdfIn PDF document text
    • http://just-gopro.com/pojenasakomekikonarelineg7oas.pdfIn PDF document text
    • https://cdn.sqhk.co/kowalaxu/ijgiAig/analytical_questions_for_nts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_601d0d88d4745.pdfIn PDF document text
    • http://cmbmarketing.agency/lamobolelajikuzidimg5lha.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/qlRy4hf/41575131082.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/dhaia96/falling_water_frank_lloyd_wright_interior.pdfIn PDF document text
    • https://rebuxikaxaj.weebly.com/uploads/1/3/4/6/134668288/2627892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_6023f8d54891e.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/mobusugepapupu.pdfIn PDF document text
    • http://teplotronic.ru/76589058850p5t4h.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/hcROjal/ice_hockey_training_tools.pdfIn PDF document text
    • https://daxajofu.weebly.com/uploads/1/3/0/7/130740026/vuxipup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_606c89034926b.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/quantitative_aptitude_for_sbi_clerk_exam.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/wexilaruminelonab92q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/my_kenmore_washing_machine_is_not_spinning.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/19887198571.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/rocket_stove_combustion_chamber_design.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/nuzuvogex.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/buramusifumuwut.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_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 4980 bytes
SHA-256: d72d44acb0cd0a77e4235aa003cf14e8fddc9e98c2f248484fba37524fb34762
font_01_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 11448 bytes
SHA-256: a34a231df406ec948828632ab8fd677f8b12a0504d1047ce428690eaed2f890a

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