Malicious PDF — malware analysis report

Static analysis result for SHA-256 d395d9513cb41e3c…

MALICIOUS

PDF

83.1 KB Created: 2021-03-31 02:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4f3d354563e0bffe94234445fd1e029b SHA-1: 5ac36edb2c5c823244d4b1594dab2446cdf4faed SHA-256: d395d9513cb41e3cb4d3b5aefdbec62eff4f87f9c3f541c2ef26178c77c43d57
186 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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/award?keyword=baldur+s+gate+2+official+strategy+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/zowolanazew/8jaijhc/god_kings_game_download_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/idieUiT/graphic_design_software_for_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kebubupoxiz/7HoEjhd/baal_veer_song_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekata/bvibq2f/37116810259.pdfIn PDF document text
    • http://zotegomowivin.22web.org/vutedakejamobaxigaxubelun.pdfIn PDF document text
    • https://cdn.sqhk.co/fovekuleru/gkjbgdt/kingdom_come_deliverance_from_the_ashes_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_60158f8df0e74.pdfIn PDF document text
    • https://cdn.sqhk.co/ginijetemepa/rysjcan/72416593049.pdfIn PDF document text
    • https://cdn.sqhk.co/firumefetev/Oifidgi/54125661533.pdfIn PDF document text
    • http://roxifij.22web.org/helping_verb_worksheet_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5fdb6e157fa86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470220/normal_6045067558818.pdfIn PDF document text
    • https://cdn.sqhk.co/zonelatu/gjeicco/solupozu.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/ibYjagc/38154047976.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_f9332cdf75cf4de196f9866b59cff7c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/58841501037.pdfIn PDF document text
    • http://suwulinivez.rf.gd/55589510763.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/how_to_sue_for_job_discrimination.pdfIn PDF document text
    • http://mivajodeki.epizy.com/free_online_plagiarism_checker_with_report.pdfIn PDF document text
    • http://pibumox.rf.gd/acca_f9_december_2016_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/piwekejupubazoxuzidavo.pdfIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_f2813d607f334e199fbaf86943fedba2.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_9f8a1a11811a4646845d5587709142d9.pdf?index=trueIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_f065eb2f6da84de99cf49443204f53fa.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_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 5604 bytes
SHA-256: b0b953d4b74339328161e546347b9882f24f50dfd943efa474c489c6d74957b1
font_01_sfnt_off00011a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7C 10496 bytes
SHA-256: 0d325cbd75ecc322d6356dbe84d8347dc31c287ef0ea21fcb9d30e1af5c81fbb