Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0f8e8ed34116e4…

MALICIOUS

PDF

74.3 KB Created: 2021-04-08 01:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab41f124577bd4f8e3f0f7bd42163f43 SHA-1: d1ce04cc1103615989a428d31cff04a065d0eb42 SHA-256: da0f8e8ed34116e46799a666ec06d208475fc3938780e431e7f0236138d98e43
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or SEO spamming operation. The embedded URLs point to domains that are likely used for distributing further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/wix?keyword=claim+of+fact+value+and+policy+meaning
    • http://wejuzofibab.medianewsonline.com/how_to_get_rid_of_red_acne_spots_on_face_fast.pdf
    • https://cdn.sqhk.co/julubesaf/jcjw0hi/chicken_invaders_5_cheats_free_download.pdf
    • https://sazigusejif.weebly.com/uploads/1/3/4/7/134771803/wives_xevow_desik_vefuwokot.pdf
    • https://cdn.sqhk.co/zupololano/cRXZ0dn/elder_scrolls_blades_cheats_nintendo_switch.pdf
    • http://kovuzaxaf.medianewsonline.com/93812902287.pdf
    • https://kevuwegifutawed.weebly.com/uploads/1/3/4/7/134746568/koluz-bejaf-mibopibavodu.pdf
    • https://cdn.sqhk.co/fopikudapom/jhhcagg/black_widow_avengers_assemble.pdf
    • https://cdn.sqhk.co/kisereta/nrUgnjb/download_game_mobfish_hunter_mod.pdf
    • https://cdn.sqhk.co/liwewajawab/HLhfJEC/32017417453.pdf
    • https://dadixuva.weebly.com/uploads/1/3/4/0/134018012/kimitagani.pdf
    • https://baxukeze.weebly.com/uploads/1/3/0/8/130874478/muralemekazene_jumegosot.pdf
    • http://ranupila.mywebcommunity.org/aladdin_broadway_musical_script.pdf
    • https://cdn.sqhk.co/legikowe/48Hjghh/masajubuseleramiduviri.pdf
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdf
    • https://cdn.sqhk.co/sovokeduseb/co9ehft/cream_cheese_frosting_recipe_for_sheet_cake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c953f3a6-929d-4efa-a089-71f455c7d7d8/gmat_prep_guide.pdf
    • https://s3.amazonaws.com/wamatasamegu/pak_army_black_uniform.pdf
    • https://uploads.strikinglycdn.com/files/3539568e-d2d0-4d69-9a67-5f5c8c38c72b/how_to_make_money_trading_digital_currency.pdf
    • https://s3.amazonaws.com/rogugagatuf/67867341261.pdf
    • https://uploads.strikinglycdn.com/files/f57f9f40-2671-4b47-9556-0de3fb69b25c/is_toro_a_good_brand_snow_blower.pdf
    • https://s3.amazonaws.com/palevijuj/what_is_the_purpose_of_literary_criticism.pdf
    • https://s3.amazonaws.com/bupijila/airport_announcement_voice.pdf
    • https://uploads.strikinglycdn.com/files/ff17397b-f1e6-4e22-867f-bc48ea617473/bameronasobujem.pdf
    • https://s3.amazonaws.com/vovopafubipu/excel_online_user_guide.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_off0000e89a.bin
75a0412d3436706d721b0c638a38093824c85c2534bac04da8f4d1937e31b0b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 5268 bytes
font_01_sfnt_off0000fa8d.bin
630347c7bd6d8b0d30ee027c2ba0d01e93dcf8cdd9827b2fd7921fd76fbdcf0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 9680 bytes

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