Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a8ecc62ef14098…

MALICIOUS

PDF

86.4 KB Created: 2021-03-16 13:12:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e6f40e52779fb8c2c2ec3425e51070f SHA-1: d5c6d5cad48ec0818719056bd9eb9a352b3950fb SHA-256: a2a8ecc62ef14098dd53ba02921adcca082be6d52a41735cc00e726b47e4c513
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, indicating malicious intent. It contains a large number of external links, with a primary URL pointing to 'pelibifir.ru', suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/wix?keyword=who+invented+the+weight+watch+belt
    • https://vunivejo.weebly.com/uploads/1/3/4/2/134266425/watojiwesoga_gotegopejo.pdf
    • https://sipavokipepino.weebly.com/uploads/1/3/4/3/134330850/8275547.pdf
    • http://de-bewertung-id2842384.icu/81265545329z5zcd.pdf
    • http://sysfix.ru/7921219514el0jr.pdf
    • http://cetapp.xyz/gufuxokcaeor.pdf
    • http://fresh-ita.fun/jogabizetimibajipeviwazi05mij.pdf
    • http://checkmyscore.info/pogivubitasapanivexaletujnofuf.pdf
    • https://juvedolukojubis.weebly.com/uploads/1/3/2/6/132682904/3425340.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vaxebisapesi/44789967894.pdf
    • https://uploads.strikinglycdn.com/files/43a89136-11de-4991-b948-240e4d93fb30/sony_xplod_52wx4_car_stereo_user_manual.pdf
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_b6eb39a61ec240cbb5eec4d63499734b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/68a1f7f0-3173-435d-9433-2fc882d99f26/86913509772.pdf
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_b03203b221e14f62aefc79032fefba95.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ed57f92f-46e4-4b9a-87e8-51e8d5ac1d0d/brother_mfc-9130cw_reset_drum_counter.pdf
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_163f7bfb2981471588a3cac6119eaddb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8d1b76ec-d3dd-4694-acc9-1747b7cf8d6b/dupufepukajelivedam.pdf
    • https://uploads.strikinglycdn.com/files/c1bd90a4-f537-4ded-be10-6f34cada17c8/25808135249.pdf
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_5e9849b9e46b43859bef9865eccb6024.pdf?index=true
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_04f77dd24e384b55923f1f16a2f31455.pdf?index=true
    • https://s3.amazonaws.com/muwomapotumugi/android_cardview_tutorial.pdf
    • https://s3.amazonaws.com/bezorito/coacervate_lab_answers.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f077.bin
53b7f5936b09eaf35fba3c7f011d118d90f69445702e1eb93b0958ee6ff36eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 5020 bytes
font_01_sfnt_off000101a1.bin
f7ef64c6109a4c9286698dff512a904000d693e46b6acc1a3cfbac9ec0af94b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 11196 bytes
font_02_sfnt_off000127d6.bin
f267a97a42ed964490c0c36cf8d24d30f5cfc386ee24850e75bb3a4991f11828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127D6 16376 bytes
font_03_sfnt_off00013d7e.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7E 4324 bytes

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