Malicious PDF — malware analysis report

Static analysis result for SHA-256 db35b3624c5105c7…

MALICIOUS

PDF

74.7 KB Created: 2021-03-27 23:17:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f251e415e5387b84affc144121e1153b SHA-1: 13a05abb81387c4109b1511538fef067106eb86d SHA-256: db35b3624c5105c7265fd273d619fb2a7bbd2188f75f025242309c9d65a42a82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=adagio+dazzle+siren+form PDF link annotation
    • http://bosnoslovnoejelaniekupit.xyz/wibitotobati6awqu.pdfIn PDF document text
    • https://duvujisukodat.weebly.com/uploads/1/3/4/6/134674851/ximikefuwux.pdfIn PDF document text
    • http://tirepusimexopi.22web.org/88029763738.pdfIn PDF document text
    • http://greenbike.shop/xoxopivod32sz.pdfIn PDF document text
    • http://specialsale.info/factoring_difference_of_squares_worksheet_kuta_softwarepxyon.pdfIn PDF document text
    • https://dojomataz.weebly.com/uploads/1/3/4/7/134700303/208969.pdfIn PDF document text
    • https://sazizilas.weebly.com/uploads/1/3/0/8/130874530/3090783.pdfIn PDF document text
    • http://petersikdar.com/child_abcd_video_songsnsn3n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wizifaj.rf.gd/23260903460.pdfIn PDF document text
    • http://sokevigaku.rf.gd/priest_ragnarok_eternal_love_guide.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_a4c4bd47d7a549138fcc51d3675c5873.pdf?index=trueIn PDF document text
    • https://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_0649ad65a707414a9c5154444aab9974.pdf?index=trueIn PDF document text
    • http://wokoziguroron.rf.gd/convertir_milesimas_de_pulgadas_a_centimetros.pdfIn PDF document text
    • http://bofofopefolag.epizy.com/wuxizoponupufajiluxigojeb.pdfIn PDF document text
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_695124a2ca564095893f140a771e2471.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_3caceae0b8be4edf832a7bdbd13c7abd.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 5264 bytes
SHA-256: b26358b5f36e1ec49f738e56713e99db2337c2e2836f100790ca8962627c2b16
font_01_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 11648 bytes
SHA-256: 298b014e81db7609f64c548fa519f6150af7906ea42036f9f0b852c1c16007a2

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