Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f51b89ad6804fc7…

MALICIOUS

PDF

90.1 KB Created: 2021-03-10 15:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: faa375b8b513fa0ba5fad592f0af233c SHA-1: f0933a153925ce83a6a18f786509c995ba6406dd SHA-256: 1f51b89ad6804fc7ef39cacc9d85cdf132994b0ee612ad78603258e8fd70cf25
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs, including one pointing to 'golowaki.ru' with a keyword suggesting a form, and another to 'loneresel.mygamesonline.org' which is flagged as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://golowaki.ru/award?keyword=colorado+immunization+form+pdf PDF link annotation
    • http://loneresel.mygamesonline.org/33351783645.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/is_it_bad_to_eat_too_much_fat_on_keto.pdfIn PDF document text
    • https://cdn.sqhk.co/menekilebuz/D7ibHha/wowulibubo.pdfIn PDF document text
    • https://cdn.sqhk.co/nunologen/ifPhfgj/bottle_flip_3d_game.pdfIn PDF document text
    • http://mybiol.site/guide_for_among_us_impostor_font2vqlb.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/sofowuvikemo.pdfIn PDF document text
    • http://helplnstagramoffice.com/31639559548lh0jq.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/biluzijumekof.pdfIn PDF document text
    • https://cdn.sqhk.co/rirelolut/LjdI2gj/mewifikosifutojusuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c219840c-95f1-4f6c-aa78-10a041716ba9/jawbone_jambox_wireless_bluetooth_speaker_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d147efbd-7051-4fd5-9d6c-c7aa6dd1f5fa/72902890698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c06de499-ece4-474c-a32f-260e3fbc40ff/80459195360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38888d8c-9a8b-433a-9a39-d5ed6e717827/what_juice_is_good_to_reduce_high_blood_pressure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c50f1a-9dfd-4c97-a970-6fbc1c372002/canterbury_tales_modern_english_prologue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5503038f-8303-4fd2-86c5-17c207134ea7/joxewekamowegibanu.pdfIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.orgIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 7916 bytes
SHA-256: e59037b55eb65fa6455cf1c6287e33a9d16be46809afb7af2e33fa14b570a7d3
font_01_sfnt_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 3448 bytes
SHA-256: 088e5e32db4ff94ac1a0e936a80de13d5aa64f414369b98223c5330439850725
font_02_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 4848 bytes
SHA-256: 70018fa2148882ef55657e8ae19c2d2851ebe1d7485185a7d1b00fd3e4669a77
font_03_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 10888 bytes
SHA-256: 555240a83429d75ff04de546b3e2744b7febf73e7bfd3b020b68a169286acca8
font_04_sfnt_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 16460 bytes
SHA-256: 9fe3012d424a293a5c80d299f00344a6da4d05d2d977e507917c6e1d0fd7a906
font_05_sfnt_off00013ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDC 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
font_06_sfnt_off00014bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDA 4216 bytes
SHA-256: 75134b945a4a9dbb8ce77b797e7f472ce2c82461d1228df2e7083c6e6f47270e

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