Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1e0878ab04541a…

MALICIOUS

PDF

72.3 KB Created: 2020-11-10 12:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 56ddb2728fb62239b8223c5db3456055 SHA-1: 77083b087d9a5ce106ade93854c983706ea1b49c SHA-256: 3f1e0878ab04541a733b343c90626b695c95cf80001eb38f42236b3baf27cb4b
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one specifically pointing to a URL designed to mimic a Yahoo mail login page. This suggests a phishing attempt to harvest user credentials. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for numerous links, further supporting the phishing lure. No scripts were extracted, but the presence of external URIs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffe.ru/strik?keyword=yahoo+mail+login+home+ngremalet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f8dba35a31b5.pdfIn PDF document text
    • https://jabudebixeref.weebly.com/uploads/1/3/4/3/134398441/6612576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_5f8d153ab5a9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5f8bbccac2082.pdfIn PDF document text
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/4694705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5f89bcc2b6556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5f87b66b2217c.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/bogajip-febub.pdfIn PDF document text
    • https://zowisedaro.weebly.com/uploads/1/3/4/3/134355737/7e2135dbee3a4a.pdfIn PDF document text
    • https://fineruliji.weebly.com/uploads/1/3/4/3/134313455/9418821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_5faa0ea4713e8.pdfIn PDF document text
    • https://fetofopup.weebly.com/uploads/1/3/4/5/134507679/8821434.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/4964048.pdfIn PDF document text
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/9861745.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/e0e51322-f5a0-48a0-b0f2-bb6a224487c6/ligefalebivevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c7a9de-e765-440a-93d2-11ba27eae364/30863429470.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_off0000d0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 4672 bytes
SHA-256: 37df15187741e7690bf590b9495b98cd93af0304757feb39b93183210b22e42e
font_01_sfnt_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 11072 bytes
SHA-256: 8a6f5a772b067fc32df67c8cd6f3cbef104ec0fe2569a1c1d4e253cba7dbe8d9
font_02_sfnt_off000105d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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