Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4bd020b0cbc218…

MALICIOUS

PDF

80.3 KB Created: 2021-04-05 07:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 565a0567e52225601b0cf9e9e354f0c9 SHA-1: a8259238787265ca6b1f6b1e2c904e0f889b9c3d SHA-256: ad4bd020b0cbc2185e5831b5f04e40c45485ee5009c1591a3931c7ecd762083b
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains a large number of external links, many of which are hosted on free file-sharing or website builder platforms, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be related to a motherboard manual, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=hp+8000+elite+motherboard+manual
    • https://bumibaniligaza.weebly.com/uploads/1/3/1/3/131383581/4f708b1408.pdf
    • https://cdn-cms.f-static.net/uploads/4388046/normal_6034746243322.pdf
    • https://bukalejobiwasek.weebly.com/uploads/1/3/1/4/131409200/8090996.pdf
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/9cf862.pdf
    • https://static.s123-cdn-static.com/uploads/4470678/normal_5feea94f14912.pdf
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/mavidokapidimeguge.pdf
    • https://zomuwobab.weebly.com/uploads/1/3/0/8/130873958/23daca4.pdf
    • https://kusafulidofet.weebly.com/uploads/1/3/4/0/134017607/vumitibuzo-danefedemul.pdf
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/5ae09ff.pdf
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5fe76aece8ffb.pdf
    • https://cdn-cms.f-static.net/uploads/4375702/normal_604065443f362.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://97e6e6c8-040d-427c-ad66-6ef02350ae38.filesusr.com/ugd/9c523c_e497ff58270a49e9812e1f29dd039fef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/82031522-5bbf-4369-a499-e65179bcefe2/23058948019.pdf
    • https://uploads.strikinglycdn.com/files/0bdbcc1a-cf8f-47d6-9872-6b5f4cae0c51/49813414355.pdf
    • https://uploads.strikinglycdn.com/files/b9cbe443-d4e9-46c9-bc57-3551bf73da33/vezotigog.pdf
    • https://uploads.strikinglycdn.com/files/fc09a8fb-205b-41a9-8c5b-5f05c44cbf0d/how_to_light_my_majestic_gas_fireplace.pdf
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_48588cd368b54fd9ba8fcf1156c09b48.pdf?index=true
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_39476254d3a940978cf9f0547440fa9f.pdf?index=true
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_e202619d9272401a84c8625483132c2e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/37033c59-85da-4f86-86b5-c0e0ae8e1557/sotuvosi.pdf
    • https://uploads.strikinglycdn.com/files/441a08dc-9145-4cb6-acf3-17023fed37a0/shark_navigator_dlx_reviews_cnet.pdf
    • https://uploads.strikinglycdn.com/files/809f5cfe-1a17-4b52-a095-33cfbdd4adb1/99473825280.pdf
    • https://uploads.strikinglycdn.com/files/301c1f94-4400-45c4-8998-30d61063506b/57227864878.pdf
    • 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_off0000f6ae.bin
0b689175d3998972f66fffe030af1bc50ac0df46317f4d87c50a7c79e56dd0ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 5460 bytes
font_01_sfnt_off00010909.bin
14c0fc2f54fb793341e39bc7ac2cb2baa0d16b54317bb49be98f8bc5c48dfffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10909 12168 bytes

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