Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1b4ebe49c6784c…

MALICIOUS

PDF

79.9 KB Created: 2021-02-25 11:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8f7873985146361775b1754b5a4c5c14 SHA-1: 72177f42203c56f38066a793dfa9d512da5f6605 SHA-256: 8d1b4ebe49c6784cf8a1b07892327ee1a3ab7b052376a358de394fe99e31ccf9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous external URIs suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://sitegevom.weebly.com/uploads/1/3/4/6/134664280/rulironixujuzopuno.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450242/normal_600e40b381c38.pdfIn PDF document text
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/wezirorata.pdfIn PDF document text
    • https://xiwupezarevapo.weebly.com/uploads/1/3/2/6/132681984/00c7fc.pdfIn PDF document text
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/3668556.pdfIn PDF document text
    • http://noxokolozoj.iblogger.org/is_gdp_per_capita_the_same_as_average_income.pdfIn PDF document text
    • https://felonuwonab.weebly.com/uploads/1/3/0/8/130814100/mevenagitumufira.pdfIn PDF document text
    • https://pemogele.weebly.com/uploads/1/3/5/3/135324676/6449013.pdfIn PDF document text
    • https://tirokaroxere.weebly.com/uploads/1/3/2/7/132740449/53ec7fc29201631.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/brookstone_wireless_speaker_recall.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/nekefatevitidilexaduzofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_601dada23997b.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/3055042.pdfIn PDF document text
    • https://fojaloda.weebly.com/uploads/1/3/0/7/130776233/podutiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367674/normal_5ff7ce09ac712.pdfIn PDF document text
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/wizobuletubif_nipujetefibuwid.pdfIn PDF document text
    • https://maypoin.ru/wb?keyword=the%20dialectical%20behavior%20therapy%20skills%20workbook%20PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gosaduzunake.myartsonline.com/how_to_stretch_for_plantar_fasciitis.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/internet_speed_test_ookla.pdfIn PDF document text
    • http://dejogamolefip.rf.gd/65481977550.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/jewugivigajebuxiju.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/bilonobufoxurojometuvab.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/xelelokijaz.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/did_charlie_from_flowers_for_algernon_die.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_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 6012 bytes
SHA-256: f6f0c78a8912db5c3bff78bba59d00ef7630982efac8a4473a57f5c947eec45a
font_01_sfnt_off00010b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 10320 bytes
SHA-256: 14678aa1e6cc961879a91c69220b37f23245b89abc0f39a9b20dfd909090aa7f