Malicious PDF — malware analysis report

Static analysis result for SHA-256 76560a6b75640147…

MALICIOUS

PDF

95.5 KB Created: 2021-03-31 09:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d49740cd9cfa7853ba14d440ec05f07 SHA-1: 74b81c6da8fbc612f60a97458edcfe75e4680644 SHA-256: 76560a6b756401472ad31725c4884f0902d9e7e7963f6461d54c4507aa762c67
156 Risk Score

Malware Insights

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

The PDF file, disguised as a 'Shark uv560 manual', contains a significant number of external links, indicating a potential link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the presence of numerous external URLs, including one that appears to be part of a SEO-manipulated link farm, points towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=shark+uv560+manual
    • http://re-capital.ru/how_to_get_inventory_report_in_tally5ymly.pdf
    • http://ubsvp.com/cacti_for_windows_freesz59k.pdf
    • http://airet.space/fx_9750gii_integral6mvam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_256b5bd2e1504f1b931ecfdf656c242d.pdf?index=true
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_d627e405bd274ad4933543b5e6987b2b.pdf?index=true
    • https://s3.amazonaws.com/vuterijoze/bevavosanumakoxebegitobo.pdf
    • https://uploads.strikinglycdn.com/files/c84afa32-3a18-4343-ad67-d94647153fdb/84043241634.pdf
    • https://s3.amazonaws.com/werowibovezoje/77289745229.pdf
    • https://uploads.strikinglycdn.com/files/c062b3f1-128e-432e-b679-ee98fff5193e/berkshire_hathaway_letters_to_shareholders_2020.pdf
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_1a9740e0893847dba4a16822ebb883f4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7d9e4f31-5b60-4921-8258-1047873466db/sat_practice_test_10_difficulty.pdf
    • https://s3.amazonaws.com/paropabaru/lawogetabamubuzipepivigip.pdf
    • https://uploads.strikinglycdn.com/files/315259ce-2ec5-4469-9dd5-5141c3a05feb/zebco_202_reel_specs.pdf
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_0ae517ecd50c4fe59393931cb9428f20.pdf?index=true
    • https://uploads.strikinglycdn.com/files/761e99c5-ea2c-44ae-a310-cd37737ddd9f/kalofeza.pdf
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_54c58deacf324f50b5d019d42cc88852.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7711cbe7-4680-4686-b248-380b327c57fe/xbox_360_wireless_controller_loses_connection_pc.pdf
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_51f722dce89a44df84ab753b9e4bd540.pdf?index=true
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_af5ed1bfe0df46b49a464bcb59864d80.pdf?index=true
    • https://s3.amazonaws.com/litunux/xovaremajenusew.pdf
    • https://uploads.strikinglycdn.com/files/d5d1c7e0-0b72-483b-8c8f-660670da8658/verb_tenses_spanish_list.pdf
    • https://uploads.strikinglycdn.com/files/bcdd632b-f03b-4d36-b6f4-20f91e85fb1d/white_rodgers_thermostat_air_conditioner_not_working.pdf
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_dab774cca45d4a809f74761434b5a9d2.pdf?index=true
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_6fe6d6a832824677bbedbfd8752a4633.pdf?index=true
    • https://s3.amazonaws.com/zolerazowubow/dks_1812_parts.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_off00013030.bin
eb0394c70f6b678bef638a3d9c5551ec128056d307561b5f8f7fc0900aa02936		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13030 5396 bytes
font_01_sfnt_off00014263.bin
74e67274710127aca502918994e7dc31929fa52bc1b6b94d84ab72a25cd11bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14263 13924 bytes

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