Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a876ec5943c69f…

MALICIOUS

PDF

82.0 KB Created: 2021-03-10 02:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 7d926231e168d3abaa69f69955a23322 SHA-1: 467bcb01c9735f94bd7f57ceba4b17863e2d12d3 SHA-256: 15a876ec5943c69f6c9d4af59883fe0c21bc7b9a85b7b6ea62645e6bb77d5d4c
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms and phishing. One prominent URL, 'https://jumiwimov.ru/wix?keyword=dances+with+wolves+worksheet+answers', suggests a lure to disguise malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=dances+with+wolves+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489596/normal_5fcd281d3c4c8.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/dvkx6jc/picsart_video_maker_movie_editor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493602/normal_5ff4c3db50a16.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/how_to_put_procreate_pocket_in_dark_mode.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/chfjaVd/cinema_tycoon_2_movie_mania_cheats.pdfIn PDF document text
    • http://xilatotes.sportsontheweb.net/88894584160.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/22254958424.pdfIn PDF document text
    • http://lovupijuti.getenjoyment.net/12884806789.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/schlage_keyless_entry_not_locking.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fd5f9ee44567.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/ca8babb0-9872-4484-95f5-8e93f1c8b62d/mutepedajasudizupuwakop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cd745f4-ba66-4278-a5ea-a1dff6ec5ed6/49399442951.pdfIn PDF document text
    • http://purewowesajumu.myartsonline.com/how_to_reset_lg_hbs_760_bluetooth_headset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf69f11b-76a9-476b-8507-4bd08731deab/tu_risa_pablo_neruda.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_92a16057d4d4410eba9dce22a0ae5387.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bf8db47-be2e-45b1-a0bc-fa5fffbafabc/sears_roebuck_catalog_homes.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_a6809d8e3dd2449995ece7a1297f1053.pdf?index=trueIn PDF document text
    • http://sulorowanutabu.atwebpages.com/dell_poweredge_2950_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1565b829-b2aa-4c6e-b1e1-c44655402cdd/rezapu.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/walutozitotabanibodatuw.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_27ddc672cfa14796a5ce1bfbd3172e34.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_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 5100 bytes
SHA-256: 86e9993499a4a624adb6e12d16a4f79c623df62b3fdcaf4ec8117c804faafb9e
font_01_sfnt_off000116c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C7 10584 bytes
SHA-256: 354ef720e0b189997eb328476946b7ebc6050a27a5fab58179af49d47972aa06