Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5108ec5297f0f3…

MALICIOUS

PDF

65.4 KB Created: 2021-03-01 02:17:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d615624f37ad108d870c492a5bfa2ea7 SHA-1: cec202d2534b195296cff9726922b695aab0925a SHA-256: dd5108ec5297f0f3329934fe9c2bcd66f772db80d30ff54ee91965cbaf302e44
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's purpose is to direct users to these external resources.

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://jottigo.ru/award?keyword=monster+vape+mod PDF link annotation
    • http://nutowokamo.iblogger.org/eat_26_self_test.pdfIn PDF document text
    • https://gewipilozu.weebly.com/uploads/1/3/0/7/130775211/gasonade_kevelaxoserobuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488322/normal_600c94952a9bb.pdfIn PDF document text
    • http://aycotoro6.xyz/el_libro_del_principito_resumen_por_capitulosv504h.pdfIn PDF document text
    • http://vodoroding.info/kuvebevageae4p2.pdfIn PDF document text
    • http://babysampler.com/bajonat1m7oq.pdfIn PDF document text
    • http://nejomuwixeve.iblogger.org/beowulf_modern_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383804/normal_5ff3d846b4f41.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/bolus-jideju-gukava.pdfIn PDF document text
    • https://zegadakupoxak.weebly.com/uploads/1/3/4/7/134749069/7408144.pdfIn PDF document text
    • http://uscarins.info/debufufemutu84h.pdfIn PDF document text
    • http://storeyou.store/xukatakujok37mm1.pdfIn PDF document text
    • https://wuzakadebetes.weebly.com/uploads/1/3/0/8/130814976/6746467.pdfIn PDF document text
    • http://kigonowepim.iblogger.org/calendario_escolar_2019-20_sep_puebla.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedisijusa.onlinewebshop.net/cuanto_cemento_tiene_un_metro_cubico_de_hormigon.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_off0000c4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F8 5136 bytes
SHA-256: 9ea2b660ed85cf9ce5757ae46b4e10fad5e5c8b1a96ceeaf245cdce57bbec6a8
font_01_sfnt_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 10564 bytes
SHA-256: ab748ff71de91aba634c3eeb61ab622274a9194334c5f943e68e0fe253200de7

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