Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfc7740cd39c87e…

MALICIOUS

PDF

86.9 KB Created: 2021-05-18 16:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 35249af7b79876a4c79f88a3f4c4e2d3 SHA-1: 71a850c102186fc93883212bc88060add0150463 SHA-256: adfc7740cd39c87e7dfd8bea103a61e422631f067318c5fdf3382459ab219971
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 0.9991

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://botokaw.ru/strik?utm_term=medicine+to+reduce+swelling+after+rhinoplasty PDF link annotation
    • https://zunazodofi.weebly.com/uploads/1/3/4/6/134636935/lonomipejarupetugap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403808/normal_5fe10d482a573.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393890/normal_5fef0f0199e1f.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/juwarusuzedi.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/4721935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417212/normal_6069de7ba392a.pdfIn PDF document text
    • https://moxowikoxub.weebly.com/uploads/1/3/4/0/134096036/9640324.pdfIn PDF document text
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/4263405.pdfIn PDF document text
    • https://rigopijifotifat.weebly.com/uploads/1/3/2/6/132695828/1042791.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5ffb614c4e07c.pdfIn PDF document text
    • https://pufodafu.weebly.com/uploads/1/3/5/9/135959320/wiwuwaso_godiluragar_bupegojefibuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378153/normal_5feb9d5456f80.pdfIn PDF document text
    • https://ruzunaxatan.weebly.com/uploads/1/3/4/3/134340268/nokal_musiluwuvax_woposunovezo_sepujosatinu.pdfIn PDF document text
    • https://zoxanomo.weebly.com/uploads/1/3/1/1/131163640/zeruwedeg-wuziguni-falorutevisi.pdfIn PDF document text
    • https://mizunilido.weebly.com/uploads/1/3/4/3/134352057/6990454.pdfIn PDF document text
    • https://tarazedi.weebly.com/uploads/1/3/4/6/134687061/matos.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
    • http://jasulogitese.rf.gd/how_to_spot_drug_traffickers.pdfIn PDF document text
    • http://buzezozamedat.rf.gd/price_for_honda_rebel_300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2990bd82-f5e7-4d50-a9d1-0316fae08110/49828015472.pdfIn PDF document text
    • http://jojofolarimema.epizy.com/wipokokilabilizogetilefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c18c2a4-1c26-4b12-8ebc-e7abb62eceb2/will_a_chamberlain_remote_work_with_marantec.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b3bd77-3dc3-4307-9700-365bdbf75718/tunut.pdfIn PDF document text
    • http://tukejome.epizy.com/sql_server_2017_enterprise_edition_free.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_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 5496 bytes
SHA-256: e2c5c3e3831d6a7883f5ae1f694f3eebaab52a59d05f98bcc972b845485d9906
font_01_sfnt_off00011825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11825 11008 bytes
SHA-256: ae606d3ddd4a2bb70d67b2efff6f23d94c099d07f83082b0c2204f91244d6efe
font_02_sfnt_off00013dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361