Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7daa0fcdd0957c…

MALICIOUS

PDF

89.6 KB Created: 2021-03-18 21:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: aad8db308578357d6fe4a65d95602de8 SHA-1: 6f3f6a57e1ee851b632634bbed537fe4901624b3 SHA-256: 1c7daa0fcdd0957c29fb52e7d41ea468ca199f88bc7385d0138b5e63c318163b
126 Risk Score

Malware Insights

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

The PDF file is classified as malicious by ML and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to a disposable domain, likely serving as a lure for users seeking educational materials. The document body, though heavily obfuscated, suggests a pretext of providing a worksheet, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=topographic+map+reading+worksheet+with+answers PDF link annotation
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/17c72c4557d6.pdfIn PDF document text
    • http://mejuzuw.scienceontheweb.net/filehippo_to_jpg_converter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_60313b27bb3af.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/f0e2c6318c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_6017222eb33ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414701/normal_5fe080bc5aaaa.pdfIn PDF document text
    • https://vobinuxidixuf.weebly.com/uploads/1/3/4/4/134471365/3115778.pdfIn PDF document text
    • https://juposuwidamad.weebly.com/uploads/1/3/1/4/131406248/5801597.pdfIn PDF document text
    • https://gamupizesusaza.weebly.com/uploads/1/3/1/3/131398140/vizixuxebewu.pdfIn PDF document text
    • http://nibewubixela.getenjoyment.net/47304295145.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483349/normal_5fcdef9be74a6.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/dagasopones/unity_biotech_stock_news.pdfIn PDF document text
    • http://supegawezokex.epizy.com/15976674934.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/jomebuxirogeluzukazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1843cc1d-e9e6-4fc4-92d5-ce50f638a5f3/what_is_checklist_observation_in_childcare.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/plantronics_voyager_edge_bluetooth_headset_schwarz.pdfIn PDF document text
    • http://kegigija.atwebpages.com/adobe_photoshop_cs2_shortcut_keys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9182929-0535-4d3a-a813-4c290069e1ad/jikapomawenibo.pdfIn PDF document text
    • http://xinonot.epizy.com/bangla_boi.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/15284694488.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_off00011ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 5560 bytes
SHA-256: 5b46bcb4e91d9ebab146bc559e1eaa6fb16af72d0a388158b12bfe2c1c198c24
font_01_sfnt_off00013192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13192 11852 bytes
SHA-256: ef2152209e7be97b5e04d79b3f199748e6083c902569943a59893a135a4c3e81

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