Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46eb857d56f6502…

MALICIOUS

PDF

71.5 KB Created: 2021-01-20 06:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 99f76cda8fbed7a9e1220104a3e74d5f SHA-1: 5feae678516d7957be32a784e6ac1f74291a5b16 SHA-256: b46eb857d56f650218d600ff37f31d1f756ad1d0f0f884d020bba6a967029259
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic flagging it as a link farm on disposable hosting. The ML classifier also strongly indicates maliciousness. The primary IOC is the external URI pointing to 'maypoin.ru', which is likely the intended destination for the user, possibly to deliver a second-stage payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://maypoin.ru/wb?keyword=best%20homeschooling%20memes PDF link annotation
    • http://peroruse.iblogger.org/riwurokiguzelapiwolewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5f9213494eb9b.pdfIn PDF document text
    • http://kefowawud.22web.org/ikea_kitchen_planner_plugin.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/UNzxFW7/18586800884.pdfIn PDF document text
    • http://doporujela.iblogger.org/73906952256.pdfIn PDF document text
    • http://legugoboxebepe.22web.org/tuxopujupimotewij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/goporo/94848994973.pdfIn PDF document text
    • http://mowumaja.epizy.com/zizupotuzerimonomivabuzaj.pdfIn PDF document text
    • http://kosener.epizy.com/74489345760.pdfIn PDF document text
    • http://rakemexovujepez.epizy.com/storeonce_5100_cabling_guide.pdfIn PDF document text
    • http://nudenagazosizav.epizy.com/nanubotodasoguma.pdfIn PDF document text
    • http://ditajizuru.rf.gd/12639409672.pdfIn PDF document text
    • http://kitojob.epizy.com/sir_richard_burton_arabian_nights.pdfIn PDF document text
    • http://mezomiwewelebe.epizy.com/clinkz_dota_2_guide.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_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 4956 bytes
SHA-256: 7d6d542129505e00af4ae30f5150949fb145226df24e505833c9e95f55a86ab8
font_01_sfnt_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 11060 bytes
SHA-256: 3a9c2f83ea5a1c92407652162dedf50cb101a081e62706a61bba1c96d9094c67

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