Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d81ce607aaebb4…

MALICIOUS

PDF

85.3 KB Created: 2021-04-06 00:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b346c41a13d3db0d43b63f9fe923ed8 SHA-1: d75f66dba115154890df2f6bd3c5879bcc0752be SHA-256: 54d81ce607aaebb4b4cd566f8fbad0820377a831b8e96d87cd060acf2bb7a053
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the primary URLs, 'https://botokaw.ru/123?utm_term=vertices+hyperbola+standard+form', is flagged as suspicious. The ML classifier and ClamAV also identified this PDF as malicious, suggesting a phishing or malware distribution intent. No scripts were extracted, but the sheer volume of links points towards an attempt to manipulate search results or redirect users to malicious content.

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-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://botokaw.ru/123?utm_term=vertices+hyperbola+standard+form
    • https://cdn.sqhk.co/butuxolevu/JhSE8ii/mortal_kombat_11_switch_review.pdf
    • http://meetly.space/excel_spreadsheet_personal_finance_templatefvaub.pdf
    • http://rukozhop-guide.com/swann_enforcer_8_channel_1080p_reviewgbrdx.pdf
    • http://viwumurowiwoba.22web.org/missing_addend_worksheets_for_kindergarten.pdf
    • http://mx50off.pro/24611405205v0thi.pdf
    • http://sokfresh.fun/fovomo6yznb.pdf
    • https://cdn.sqhk.co/lixipadiwel/eizgf6t/66376774618.pdf
    • https://cdn.sqhk.co/romumoxoleno/f3VeAja/kewomuvarabewaketepul.pdf
    • http://sellforce.ru/ernest_hemingway_cat_in_the_rainitu98.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fapomotomojopog.epizy.com/flute_sheet_music_for_beginners_free_printable.pdf
    • https://uploads.strikinglycdn.com/files/d84cf0ad-cd3b-4279-898b-e153bdb0bc64/pojafalipafoguvozigubezel.pdf
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_ba96f9158fef4984b51386ee32bd689d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/78278169-c7cf-41f4-a8c8-cac79988f829/how_do_you_make_a_paper_airplane_in_little_alchemy.pdf
    • http://fudewisukot.rf.gd/assessing_reading_alderson.pdf
    • https://uploads.strikinglycdn.com/files/a784f79f-799d-46e3-9e7f-7decfe08e708/are_there_mods_for_skyrim_psvr.pdf
    • https://uploads.strikinglycdn.com/files/73ee68f6-d389-4890-86b7-189f720ab199/fapovizikudizafugali.pdf
    • https://uploads.strikinglycdn.com/files/3f34e058-6e62-4e16-ab45-da5a624187cd/75385536029.pdf
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_8e6e06267fd84b81aa1b07d1c98c26d5.pdf?index=true
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_0502683c3115471f9f08de9f479e864f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/75c78b3b-344d-4fe7-b321-ca700df90fc3/whats_healthy_at_taco_bell.pdf
    • https://uploads.strikinglycdn.com/files/4becc713-d40e-40c2-aab8-f4887af6bdb6/medulalixujoranofosasoded.pdf
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_7f7cce22905c4960ac0541548a68f7b7.pdf?index=true
    • http://jejevad.rf.gd/26518186146.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_off00010e7e.bin
0d9b6da4c6839a03ac2c53e935bf86341380f2258de6c45e67597650a99bb69e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 5604 bytes
font_01_sfnt_off00012168.bin
d230c40c276a92cb43885d0cfd6ddde03021fd4305d90388ea0db822041df6a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 11088 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.