Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1248fbf3fc7b8c…

MALICIOUS

PDF

73.6 KB Created: 2021-03-23 11:28:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5507f294545cc17cff9f07ece004b89a SHA-1: 79a9585c44a726bfcdd048c12c757fef145bd3a1 SHA-256: 4c1248fbf3fc7b8ccab023bc57ac3041d199b2b79d0a6b54ea29d4b7364b574f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://jumiwimov.ru/strik?utm_term=contrato+de+arrendamiento+vivienda+formato
    • https://tamexixufose.weebly.com/uploads/1/3/0/7/130739892/lofiz-suvuwawopitatur-totad.pdf
    • http://siviveko.getenjoyment.net/6917831645.pdf
    • http://poxiror.22web.org/how_to_change_the_string_on_a_new_craftsman_25cc_weedwacker.pdf
    • https://lixezakokigek.weebly.com/uploads/1/3/4/5/134596317/0ca8ca.pdf
    • http://nikibolerobika.getenjoyment.net/jifegemizusuwaxago.pdf
    • https://kegipulavuraruz.weebly.com/uploads/1/3/1/1/131163865/sikidimenalud_zixewojomaxena.pdf
    • https://delupizamima.weebly.com/uploads/1/3/4/5/134578079/50dd84.pdf
    • http://tiluvopira.medianewsonline.com/91670663185.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bidurudilidujug/thank_you_reply_email_to_professor.pdf
    • https://s3.amazonaws.com/pidufozu/pigukonatutaladuja.pdf
    • https://s3.amazonaws.com/rovikibixu/non_conformance_or_nonconformance.pdf
    • https://s3.amazonaws.com/setaxilitozuko/82428031757.pdf
    • https://s3.amazonaws.com/vetamedisoz/jifimufikatuwovas.pdf
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_cbe10f00dfda4c33be5a81fd02afa4e1.pdf?index=true
    • http://falalovoxiwada.epizy.com/99552918796.pdf
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_4c61c54b69ea4cadaecddffc392dbe4d.pdf?index=true
    • http://zedowep.atwebpages.com/aditya_hridaya_stotra_download.pdf
    • https://s3.amazonaws.com/sowewazulejewi/honda_snowblower_hs520_service_manual.pdf
    • http://midetimekewawa.epizy.com/luwaduvevododojonu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ab.bin
e13243a72ce1ecd727323ef11d4c0b138bbf0f89a0588e719ea774eec0cc2c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 4808 bytes
font_01_sfnt_off0000f2f2.bin
45995de6ddd4215f7c239de39c9a2c1375bfdc7e2634408a47d16fb8f2e01b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 11776 bytes

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