Malicious PDF — malware analysis report

Static analysis result for SHA-256 5085a6415913d603…

MALICIOUS

PDF

88.3 KB Created: 2021-04-07 03:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e8bbd4bcd9ca4f1fe325de08cbf88f9a SHA-1: 6edb0f4df18b148fbd45ec30ea7b495ff771757d SHA-256: 5085a6415913d603221e0c1f32969297bd0221cac3ec9e9aa6817af6c4f1c0ac
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs designed to redirect users to potentially harmful websites. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/award?keyword=caso+clinico+de+embarazo+de+alto+riesgo+pdf PDF link annotation
    • https://tefitosuwit.weebly.com/uploads/1/3/4/4/134478986/3d5a38828d9.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/ahjidLR/rajigurabeligebiliwarim.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/ghjigd0/7_wonders_duel_expansion_pack.pdfIn PDF document text
    • https://febadezupuwile.weebly.com/uploads/1/3/1/0/131071278/ff7123b96.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/hvgjjch/chahat_album_songs_ming.pdfIn PDF document text
    • http://levantegroup.net/cast_shadow._psdqicyk.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/nojipituk8xog1.pdfIn PDF document text
    • https://xamubamujizej.weebly.com/uploads/1/3/1/4/131483378/fodose.pdfIn PDF document text
    • https://cdn.sqhk.co/xekawiba/i18jiDs/ggy_girl_offline_games_apkpure.pdfIn PDF document text
    • https://vevotudoxis.weebly.com/uploads/1/3/5/3/135313682/muduvuv.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/picijdu/used_car_price_estimator_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/rewufarelaze/O1jdiiv/car_manufacturer_tycoon.pdfIn PDF document text
    • https://cdn.sqhk.co/kawaniroti/dgimijY/linkedin_learning_logo.pdfIn PDF document text
    • https://cdn.sqhk.co/nazabimon/qhgcjbj/mekuraguselepamemopow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/199ad640-7155-48ec-9e50-61d6a8592e99/niv_life_application_study_bible_third_edition_personal_size_leathersoft_gray_teal_red_letter.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_d5fcc35b54694cc08774cba5cf68679c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd2b29b7-5076-4885-92c2-8b2e9d7a524f/apple_itunes_hip_hop_charts.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_d44036fe870e451689d7af14bfed6216.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_a955029c810a40c9a263afb83c158138.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_5f480933374e48b8a7f24593f78e0aed.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001309d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1309D 20112 bytes
SHA-256: d09191c96ce0b68d23bd68cead7702ceb4a76bb2706b8217ecad163b75caa45c
font_00_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 5568 bytes
SHA-256: 6a27751d0b24bca2cede1d58d0578c2e403fba21959b6f3aeeea5d0c3b8102d5
font_01_sfnt_off000109b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 11348 bytes
SHA-256: b9716b07571c38c3838e8ebb60aee3715b645c8cdcfd9ca8947b1eb51e7a34f7