Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2cb627cdfb2151…

MALICIOUS

PDF

71.7 KB Created: 2021-04-06 23:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f226d35db4bde30ba20d1ec6ef677afd SHA-1: 7ae4d06a4f80b16de71902d6778075ae860f1455 SHA-256: ed2cb627cdfb215194a5cef342f211a714e006d3d1a5fde640a45de7b25146c0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a 'Pdf.Phishing.Trojan'. The document contains a large number of external links, suggesting a link farm or redirection attempt. One of the embedded URLs, 'https://jacksth.ru/award?keyword=pdf+to+word+converter+arabic', is particularly suspicious and likely serves as the primary lure for users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=pdf+to+word+converter+arabic
    • https://cdn.sqhk.co/simikitivo/fyhe9LL/99388842907.pdf
    • https://cdn.sqhk.co/kisereta/iesicZU/zifenopevavipisolewofov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/voxulija/come_on_eileen_violin_sheet_music.pdf
    • https://s3.amazonaws.com/kabisebax/hoover_wet_and_dry_vacuum_cleaner_instructions.pdf
    • http://tigaxulajaju.epizy.com/lovufojemeposo.pdf
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_0879201d95054947a609879cf8fc1d06.pdf?index=true
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_592637096085421d84d193096a0dc96e.pdf?index=true
    • https://s3.amazonaws.com/zalomi/how_do_you_work_out_exchange_rates.pdf
    • http://suwojib.rf.gd/4d_printing_technology_a_review.pdf
    • https://s3.amazonaws.com/fosawef/free_music_s_for_iphone_7_plus.pdf
    • https://s3.amazonaws.com/jukezeluf/does_hyundai_still_have_engine_problems.pdf
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_0f7ba67717574b6abb657597908e0c89.pdf?index=true
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_c7889ee0235443d4b416f3de56a5be39.pdf?index=true
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_a1357a6070a54da9ab12c2e3c5c3001d.pdf?index=true
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_d8b8883ff1c94c2eb06b25cdb23d454f.pdf?index=true
    • https://s3.amazonaws.com/fasudikek/23774381769.pdf
    • http://xabazuwodumodo.epizy.com/binomial_distribution_examples_and_solutions.pdf
    • http://kinikodiraxo.rf.gd/torenupufafevabobuzekur.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_off0000d9cf.bin
bfaeddd127f3b7b4b701085f95b0119cdb03b9c235b2de67900b35c95cdcd10d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 5100 bytes
font_01_sfnt_off0000eb4f.bin
535b071fa49b93d4cfce889de2909f49072bb6e93458751b4a7f9d918196630a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 11384 bytes

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