Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a859c1cf0be6f1…

MALICIOUS

PDF

81.9 KB Created: 2021-04-04 06:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 431f439bf91d6c0d8b05dd5df3cd61df SHA-1: a9136c9b9495dbc29e6f5d82470fa4c9cd000c4c SHA-256: 58a859c1cf0be6f19d5bfdd5dbe05433ea898e746823143799fd34b5b1a2121e
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are part of a link farm designed to improve search engine rankings. One prominent URL, 'https://botokaw.ru/wix?keyword=apk+unlimited+custom+night', suggests a lure related to software downloads. The presence of multiple PDF links and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to potentially harmful content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/wix?keyword=apk+unlimited+custom+night
    • https://fepepifufom.weebly.com/uploads/1/3/1/8/131872298/zobidasesazovus-dejukokix-makofosul-rugazojexajiva.pdf
    • https://static.s123-cdn-static.com/uploads/4458826/normal_5ff496923730f.pdf
    • https://jefaganogebe.weebly.com/uploads/1/3/1/4/131437435/wapak-wixuguvoxorap-waposusidawif-navimifuwike.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • https://virutabadipepuv.weebly.com/uploads/1/3/1/3/131398083/wekak-xufilegus.pdf
    • http://hangookoil.ru/acca_march_2021_exam_dates_deadlinesz84l3.pdf
    • https://static.s123-cdn-static.com/uploads/4381347/normal_5fe46021b3e3c.pdf
    • https://nuridofif.weebly.com/uploads/1/3/4/2/134234753/487509.pdf
    • http://bio-ita.fun/39385911565h2yel.pdf
    • https://rikatawifusozib.weebly.com/uploads/1/3/1/4/131409861/1193124.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/84994478380md1yp.pdf
    • http://requiremcgood.com/564084144496rrl4.pdf
    • https://xemedibapasuv.weebly.com/uploads/1/3/2/6/132695509/686b32722581446.pdf
    • https://kikurebimeko.weebly.com/uploads/1/3/0/8/130814200/jakitidivemonov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_fe665c6b0598465e8b9172f03f824b67.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e5c98eb2-5258-4285-a61b-fbda133dfc13/wayne_dalton_garage_door_seal_lowes.pdf
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_0d311e8aeca545cf993dadcb147693de.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d044c97e-a200-4294-b08d-3935f0184e4e/59019981012.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f658.bin
b0e7fb7a9698514327345871710d8c969d4ee670fe67f5cb556bb5dd029c906e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 5116 bytes
font_01_sfnt_off00010793.bin
260a6460db56fd97981ce67894054f842cc90ef11c55448ed35271a273631bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 10676 bytes
font_02_sfnt_off00012c2a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2A 4324 bytes

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