Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecda8c4d88f216ae…

MALICIOUS

PDF

76.9 KB Created: 2020-12-08 17:06:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ccba87ee693d51dbf228dd06587c6068 SHA-1: 943b539feddce8d0265f80d330546add6ba5a20e SHA-256: ecda8c4d88f216ae990374ac86f19af9813e3cae6d77d12d64e190c413f95095
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, identified as a link farm. Several URLs point to disposable hosting services, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=insulin+glargine+davis+drug+guide+pdf PDF link annotation
    • https://polipofixino.weebly.com/uploads/1/3/4/5/134598506/viwopuliz.pdfIn PDF document text
    • https://nujusokomofevak.weebly.com/uploads/1/3/4/5/134503883/gigule.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/3034102.pdfIn PDF document text
    • https://pezitojuxesuvog.weebly.com/uploads/1/3/4/6/134608136/5645558.pdfIn PDF document text
    • https://mawepalutolura.weebly.com/uploads/1/3/4/0/134040672/sozarila-febenetapoje-miwaf.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/ripike.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/9444a1a4-e009-45a0-8421-ba199ff8402e/hellboy_movie_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7aef199-c367-48b3-b313-0f934b7fca05/20171335788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/334601b7-5e78-4d98-ac66-3239094ad1d4/79129381324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8725dd-85c3-410b-8be3-ac9af3926f6d/scabbard_of_keen_edge_pathfinder.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6457460f2895dc10c6861/t/5fcaff58a51c5a1401a1ade4/1607139161302/wikitravel_kingston_ontario.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/capnography_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27889161-3b0d-4eef-be0b-6e20ab8a1c00/drop_down_hidden_gun_shelf_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c61093-e97b-4fcb-a07a-4a182757234f/rotowixubanovaju.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_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 5204 bytes
SHA-256: 394c44196a3266adfe508d79ee1b742dd6ed7a3bfa6288871fab108e5138f92d
font_01_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 10412 bytes
SHA-256: 41331cff68abd828411f5e3c4fb959026e99b9ac0fac11b6010eb1a4191778b4

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