Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3602849ee32ec8c…

MALICIOUS

PDF

87.9 KB Created: 2021-06-07 06:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5a6cdee22a90a24e41b88f719cd66d94 SHA-1: 45a1a695602531ff97ab3ea06462415b09d3f6d1 SHA-256: c3602849ee32ec8ce00648eddb3558d7972f894c0dbfff0805fed36d235622d5
186 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, many pointing to disposable hosting services, and one primary malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://coretry.ru/pbw?utm_term=libro+escritores+de+la+libertad+pdf+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460946/normal_60488bf571b82.pdfIn PDF document text
    • https://mifozerezol.weebly.com/uploads/1/3/1/6/131637459/vutasovipikuxov_kebuwilegowupu_manar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_602116125462e.pdfIn PDF document text
    • https://sekowuwumobof.weebly.com/uploads/1/3/5/3/135394032/wamajeroboxolu-rudobejejuwi-gotapiwunod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445119/normal_5fe4eff459478.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/92b36504-e5e1-4fcd-96f3-94d982631b9d/what_is_the_moral_of_the_fable_the_fox_and_the_grapes.pdfIn PDF document text
    • http://palejemevat.pbworks.com/w/file/fetch/144768891/gepekekoromegatasenaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61228433-d005-44c8-bf13-7e3745e1bcbc/sewing_free_download.pdfIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/144514623/dizisogugisajatevidapotef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ae8c97-1a29-4b6e-96d6-d7ef167fd3a8/87947827684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f95b05ea-96e4-4e97-8e04-0d277828e79b/dunkin_donuts_promo_code_app.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144748584/81631121581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c5ba3a-e303-402e-a388-4aaa3b9288f8/al_final_mueren_los_dos_filetype.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca46267-0c74-45d1-bcbc-7566e1d84e15/88710489536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a236488d-1462-4520-b3c0-200b1af68169/que_significa_tomar_el_toro_por_las_astas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bc48fc9-6881-40aa-9e38-8886ca60dbf0/zegagixuwebikorataxu.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/w/file/fetch/144505479/wixesukixopoloxutawopaki.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_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 5084 bytes
SHA-256: 6b3fe78ec653942bc7b301c1f0305c002f78c32110e20d07a990450ca26f84bb
font_01_sfnt_off00011c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 12304 bytes
SHA-256: e6024465b764f45bc306fb784b99beee81045d595efad01132403f103783fa5f
font_02_sfnt_off0001445d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3