Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1b0e3091b61bec…

MALICIOUS

PDF

74.0 KB Created: 2021-06-01 05:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86a7dcee8be86fd078700ef6778bcf65 SHA-1: 7b594ed7769bec1623fbfb918b234efdfa823d99 SHA-256: 6b1b0e3091b61bec00c9a31b7b2f304aff29a19c5371dd77ded567798a5b526b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with one pointing to a suspicious domain, suggesting it's part of a link farm or phishing campaign. The document body is heavily obfuscated, but the presence of numerous PDF_URI and PDF_SEO_LINK_FARM firings strongly suggests the primary goal is to redirect users to external websites, potentially for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/pbw?utm_term=where+does+lactic+acid+fermentation+occur+in+humans+when+oxygen+is+scarce
    • https://dogulusowugol.weebly.com/uploads/1/3/4/4/134493498/rurorapotefe.pdf
    • https://fejawizekojiwi.weebly.com/uploads/1/3/1/4/131438151/79a8b.pdf
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/1711138.pdf
    • https://zezowamizafomex.weebly.com/uploads/1/3/1/3/131381240/dujovogotoxabowi.pdf
    • https://vabusise.weebly.com/uploads/1/3/4/3/134385335/neneku.pdf
    • https://putusura.weebly.com/uploads/1/3/1/6/131606782/8899471.pdf
    • https://kowedanu.weebly.com/uploads/1/3/4/6/134687265/wakilagedim-jekavabob-digowuvos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/75393914-a4df-4f5f-bc2b-f0a50fa464fb/nclex-rn_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/0ad2a8ab-9424-4419-b259-12395b7f5cb7/74257321407.pdf
    • http://gufabewa.pbworks.com/w/file/fetch/144439665/3577262045.pdf
    • http://vadibun.pbworks.com/f/free_download_nitro_professional_full_version_32_bit.pdf
    • https://uploads.strikinglycdn.com/files/5900c584-4275-4e7f-8327-fdcb39a261a0/68566481393.pdf
    • http://xetibubib.pbworks.com/f/43030586476.pdf
    • http://jajafad.pbworks.com/f/xupegufuli.pdf
    • http://barumena.pbworks.com/f/paperport_14_serial_number.pdf
    • https://uploads.strikinglycdn.com/files/366d1a75-5d89-4107-a35c-1001b7d69948/mibukawelusuzoguwadobe.pdf
    • http://xetibubib.pbworks.com/f/pokemon_light_platinum_gba_free_download_for_android.pdf
    • https://uploads.strikinglycdn.com/files/4524de51-e96f-4a26-8d3d-99ed2e252823/diablo_2_lord_of_destruction_patch_1.13d.pdf
    • http://veweran.pbworks.com/f/alcatel_firmware_one_touch_upgrade_download_tool_version_s_4.2.7.pdf
    • https://uploads.strikinglycdn.com/files/eba35efc-275b-4c2d-9ab3-38ce3efde3aa/why_is_my_jbl_flip_5_not_charging.pdf
    • https://uploads.strikinglycdn.com/files/55c4ad2a-af81-4aaa-a3ce-be3db77be655/what_battery_does_my_car_key_need.pdf
    • https://uploads.strikinglycdn.com/files/89e3033d-914a-4bc6-aec1-0ca13965d076/fewositunaxeronuzepog.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_off0000e122.bin
75e2c82cbcc50beca42c2de58eaa91532e2144a5acd0851504f686b17fe164ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 5708 bytes
font_01_sfnt_off0000f48c.bin
990b6b8f93e483f89bbc2d5b0b78071edc927974bf44fc225c3098697c090be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 10976 bytes

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