Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c76ff487bcf530b…

MALICIOUS

PDF

88.8 KB Created: 2021-04-11 18:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 81fc923b537bbed2b0ea135efa95c682 SHA-1: 2b8c830b8d96f147a7f885f9764a4546fe1149e3 SHA-256: 2c76ff487bcf530bdc990f071901ff22882a99ce36710da4a2c2e346ce1b4446
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary URL, 'https://jumiwimov.ru/strik?utm_term=how+to+track+certified+mail+online', indicates a lure related to mail tracking. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://jumiwimov.ru/strik?utm_term=how+to+track+certified+mail+online PDF link annotation
    • https://xugilatopuke.weebly.com/uploads/1/3/4/7/134746985/3809828.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/645cd91.pdfIn PDF document text
    • https://gewafikawesi.weebly.com/uploads/1/3/4/0/134016732/5966206.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/vutibewavize-siremakovo-wilumaxupofigud.pdfIn PDF document text
    • https://piwebodowumogoj.weebly.com/uploads/1/3/4/8/134857209/88719f17.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/greater_anglia_map.pdfIn PDF document text
    • http://lipenav.mypressonline.com/wagoriwofudoba.pdfIn PDF document text
    • https://vuzipelafow.weebly.com/uploads/1/3/4/6/134688966/5831417.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f297dfc5-5a1b-447c-866c-e00c0406f06c/kwikset_smartcode_916_z-wave_smart_lock_battery_change.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_cc735e4c1a4e4940a0003cfd6d3c3468.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_5402e7bcf7e44436b4a03f0fa7b841f4.pdf?index=trueIn PDF document text
    • http://gefuwaw.atwebpages.com/masterworks_zelda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d724f9-c872-406a-823d-cae2f3a1b29f/miwubofimirajaval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15790498-77c6-4892-bca5-1fc5df6f90b0/2066463783.pdfIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_e92c7279210a400dbd45035df1710e0b.pdf?index=trueIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_a629ba6321e048f8a708fbde417d9c37.pdf?index=trueIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_25ab72ad3cd54aaba53e5972c147175e.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_14f1b5c9715d4db3aec928c320df339f.pdf?index=trueIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_3b872bcc77b24c25ab9097feb2f2cfe5.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_2da16f33b48b40ccaf3abf5c80bb02da.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 4892 bytes
SHA-256: 9f879aa6a92fa826223daeb9f6fb92e738025024764de30389ae183ba8d76285
font_01_sfnt_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 10388 bytes
SHA-256: e0cb898e5bf67aea24a2cd010ea080ac243e695a244852034ef84447a461e562
font_02_sfnt_off00012cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCE 17500 bytes
SHA-256: 88a45aa8aad46597c8ae4eb615993cb122f8434499622799e12d59cf2a99e64f
font_03_sfnt_off0001471d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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