Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fd828216f72a61…

MALICIOUS

PDF

86.6 KB Created: 2021-05-26 15:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 11ff890bf86ef6071720922cf0b04838 SHA-1: 757447412dc879bff02b2e2e46be4ebb95cb5ed8 SHA-256: d6fd828216f72a61c22ca8f916575fc30149373b2162e489effe132ca761c638
156 Risk Score

Malware Insights

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

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 0.9990

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 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://baarspo.ru/strik?utm_term=street+dance+of+china+season+2+winner+captain PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460980/normal_603b51b8a01e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471682/normal_60432bda0239f.pdfIn PDF document text
    • https://pejupatuwotim.weebly.com/uploads/1/3/2/8/132814375/megikexinarimizumuwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475859/normal_5fcc6d31e54c7.pdfIn PDF document text
    • https://tofabefanij.weebly.com/uploads/1/3/4/7/134726630/gozikanowelep_wipamukamefobor_dadeb_gavoxoruwedu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_60326da4f1954.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474222/normal_5ff2de3028c91.pdfIn PDF document text
    • https://kuxoredekudo.weebly.com/uploads/1/3/4/3/134368385/bomotogazofa_wavananudotovu_jajadetowo_zerinawez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_6026c55539a28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_60545d851ab8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_600ddd60bc027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473031/normal_6001eb670adae.pdfIn PDF document text
    • https://gojamomajaso.weebly.com/uploads/1/3/4/6/134616238/538f74b4f73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455673/normal_6038ea714f476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_606079bc3e984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500692/normal_600f43448d682.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/738d49ce-4c30-4ee8-994a-1d240c010ef3/18320880966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1ddbbe1-43df-4cb1-9501-47d4421c4f13/grounding_exercises_using_5_senses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5ad511-b230-4049-871d-b9b6b0ba1707/how_much_do_business_lawyers_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c74003-ed81-40dc-b1c4-7f5188174abd/dollar_general_ad_for_this_week.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be675c01-d702-4125-b0c2-63e67ba808f5/25752804860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2989da33-d834-44fe-b0fc-6de1028c103a/vuxolozavedibofufezilix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9575a61a-a671-4cc3-8538-ed36ed22d933/how_do_i_use_my_weight_watchers_calculator.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 9332 bytes
SHA-256: 13a0525240185f236044e21b80c29da0fc3c95be3cb271d87e1a89e6cbdf45dc
font_01_sfnt_off00011042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11042 5540 bytes
SHA-256: b4210ff55a01003499495bbd07ad5fd50cbd00efafbd869f8a95f6df99392840
font_02_sfnt_off00012332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12332 11464 bytes
SHA-256: 1c2e0a38199f64f04135036cd76bbc4b1b0c0f088d0fda23338e88dc95fcd09b