Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1844b8f0b551f8…

MALICIOUS

PDF

70.4 KB Created: 2021-05-20 16:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b92218b753a3ab55f32dc78c1dd42dc SHA-1: e62c32622a385041ce97dca4cbc13b2bec237294 SHA-256: 5e1844b8f0b551f8ed14f4061a44ca848f0db5b90f77add82b24dcb89cce2545
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=importancia+de+conocer+la+textura+del+suelo
    • https://karozazosepi.weebly.com/uploads/1/3/4/3/134316788/ffbc94b611.pdf
    • https://defiduzumuxel.weebly.com/uploads/1/3/2/6/132682342/18c753c1.pdf
    • https://lafuworopiraw.weebly.com/uploads/1/3/4/3/134341657/3454cb5.pdf
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/difokijuk.pdf
    • https://maposege.weebly.com/uploads/1/3/1/3/131378999/3140763.pdf
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/netakiretonivuwatupa.pdf
    • https://boxakowomer.weebly.com/uploads/1/3/0/8/130874011/b0d7df2926605e.pdf
    • https://ruxapumuful.weebly.com/uploads/1/3/4/6/134682584/7030928.pdf
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/tegifivofene.pdf
    • https://vipomumukewa.weebly.com/uploads/1/3/0/8/130813786/5148969.pdf
    • https://voloripilobolim.weebly.com/uploads/1/3/4/6/134635915/fe624a229d6182.pdf
    • https://gusotefatimadi.weebly.com/uploads/1/3/1/6/131636747/55f3ffc387df402.pdf
    • https://jodowofimen.weebly.com/uploads/1/3/5/3/135330599/149f670bec0a2c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/donarepemi/danolixu.pdf
    • https://uploads.strikinglycdn.com/files/f5bb94c6-cab3-4d86-aa58-68e101306ce4/vekoxomesisesipanuj.pdf
    • https://s3.amazonaws.com/bodajaku/collins_cobuild_advanced_english_dictionary.pdf
    • https://s3.amazonaws.com/wemupajese/72870332569.pdf
    • https://s3.amazonaws.com/lanubili/61997861469.pdf
    • https://uploads.strikinglycdn.com/files/8b23ae77-1b1c-4b1d-884b-7d0e2d35010e/what_protocol_works_on_all_layers_of_osi.pdf
    • https://uploads.strikinglycdn.com/files/4a0a97b3-7c74-43f1-a38b-4e05abf23fab/does_logic_pro_x_work_on_macbook_air.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7e1.bin
15cfc0264ae7dfb3d47d4c46df4a7d9194fcb0ba747ad90204343fe94b57f1ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 5108 bytes
font_01_sfnt_off0000d910.bin
2344a14c8997d88b7d32910f1128c4b07edaa35d9cfa60aab79d368fbe4deacc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 10648 bytes
font_02_sfnt_off0000fd2c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 4324 bytes

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