Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b97217f00a1330a…

MALICIOUS

PDF

80.4 KB Created: 2021-05-29 13:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0105c78c7a26e245a0708cf8e0215ed4 SHA-1: 784dad2970030b61e5d0230a70b5ae3cc5070223 SHA-256: 1b97217f00a1330a92c4277b4e7581e6c097fce9fd173bd4da1459bfcc3ef594
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the PDF structure align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=chasse+au+tresor+gta+5+online+croix PDF link annotation
    • https://fofapabijutoza.weebly.com/uploads/1/3/4/7/134713913/693647.pdfIn PDF document text
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/5107c4506a4fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5ff928b2930e8.pdfIn PDF document text
    • https://bujupejokoluga.weebly.com/uploads/1/3/4/5/134576849/7783232.pdfIn PDF document text
    • https://gutorurogo.weebly.com/uploads/1/3/4/0/134017664/duvenimanov.pdfIn PDF document text
    • https://pugixodazujok.weebly.com/uploads/1/3/2/7/132710779/97b73568790a4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_601eff300cf01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445731/normal_5fcf6156dae44.pdfIn PDF document text
    • https://polatubogo.weebly.com/uploads/1/3/4/5/134598163/defidumigijaropok.pdfIn PDF document text
    • https://wilogodomagifaw.weebly.com/uploads/1/3/4/7/134727865/renupogibelef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419451/normal_604d33cb79874.pdfIn PDF document text
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/timuxugijuru_janesidus_janokiwuka_puvigiz.pdfIn PDF document text
    • https://mesitumavitolo.weebly.com/uploads/1/3/4/8/134866133/6703649.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/40d57ddc-b919-4a8c-b89c-ae45d109403b/buvegijudewukemokukoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4bf3aba-66c5-4e13-af74-3b9dca6aa8f8/wejarilisapekuzijozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b4f9301-979c-4608-8a4b-b1f570abd21c/how_to_become_a_good_leader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ecfa8a-a72a-4bad-8af3-9c45e095508a/scofield_reference_bible_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fa2946-f19a-4385-b440-6df2b444c633/harry_potter_and_the_order_of_the_phoenix_pc_game_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c18aff8-3370-464c-93b5-6300545e8893/90564195504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c4b42d-13f6-46b3-a4f6-08aed1833ebb/19422081038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba32093-d739-4ae9-8d95-89fa4975f56f/polytune_2_noir_price.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_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 5160 bytes
SHA-256: 4a4048b9dcb3314f8cfefeca8b60b12e8145d0563c8813dca4bd5ecf466239a0
font_01_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 13480 bytes
SHA-256: e3afcbb3e7d8def5164b492dea02cecdaef95093fc102674f0dfd650039e7e53