Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba83891b6c81c8f…

MALICIOUS

PDF

77.8 KB Created: 2021-05-26 16:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6db2c3d08e494d19719ad9f206e45882 SHA-1: e5a72939aeaf8b9311e2fa55a425315edb6fd60a SHA-256: 4ba83891b6c81c8f60055ae8d7530956187ec3c79c0b95c7c3f08ac738032c32
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the presence of numerous external URLs points to a common technique for redirecting 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://fokemale.ru/strik?utm_term=how+to+repair+a+nordictrack+elliptical PDF link annotation
    • https://titepusigob.weebly.com/uploads/1/3/5/3/135392267/5082762.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/muvopewupadib.pdfIn PDF document text
    • https://supipujijasof.weebly.com/uploads/1/3/0/7/130739476/vafamewopawigenu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5fd060253ba43.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/89e0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453575/normal_605ba1b945158.pdfIn PDF document text
    • https://tozuriko.weebly.com/uploads/1/3/1/4/131437247/7119121.pdfIn PDF document text
    • https://diwesosun.weebly.com/uploads/1/3/2/6/132695938/6475075.pdfIn PDF document text
    • https://xuxudufekew.weebly.com/uploads/1/3/0/8/130873992/1f6162c6292f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_5fdc6855795a6.pdfIn PDF document text
    • https://furivupes.weebly.com/uploads/1/3/5/2/135295821/sikukujo_rebegogotaboro.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/7410942.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/6420074.pdfIn PDF document text
    • https://wixexiwe.weebly.com/uploads/1/3/5/3/135316610/xesekarudisufodowab.pdfIn PDF document text
    • https://mopobaseburole.weebly.com/uploads/1/3/4/8/134859053/dba764dfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414489/normal_5fe04e8c59b07.pdfIn PDF document text
    • https://vujafufitagizej.weebly.com/uploads/1/3/2/6/132696128/kusiwutopanomulaf.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/acbbd402-7f66-4899-9d79-7c3e1730543c/chemistry_structure_and_properties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/348c2bbd-9870-483b-9820-7fac78f3c33f/muwivopofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a00bee8e-b690-438e-89a1-93f284f907c1/vidixakuxitawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a03ec079-c5a5-46d4-84e7-59a23bcae27a/frigidaire_spare_parts_near_me.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 5008 bytes
SHA-256: 4c5b6cb88ad1e11c534f8b00489237632ed647c35336e8f08c2f62b3b5bd8222
font_01_sfnt_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 10924 bytes
SHA-256: 765ea7b16ae31bb3716bd6d3ed7ce15a06a855cddd580db6295d04be652801a9