Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cc9fb50c801f86…

MALICIOUS

PDF

74.4 KB Created: 2021-03-31 16:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: da437dc98ac921e44d2d75f0333cc1dd SHA-1: 862c98a07a6c952658fc0a184fb961e83a04a3fc SHA-256: 80cc9fb50c801f866f09e6a38b8cf208b710f9db73c6fe0c099b6ee04660934b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the link farm heuristic confirm the sample's purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/award?keyword=brownie+money+manager+badge+pdf PDF link annotation
    • http://fruktovik.com/how_much_weight_will_i_lose_if_i_eat_every_other_dayl7jme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_603a81f66e93a.pdfIn PDF document text
    • https://sanofawuvi.weebly.com/uploads/1/3/4/5/134588151/48068c54d58.pdfIn PDF document text
    • http://moxokivotalunuz.iblogger.org/does_xm_onyx_have_bluetooth.pdfIn PDF document text
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/lefutotutu_pebujowazuwude_wonabewajil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368760/normal_60061e51d1f04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443802/normal_602b266fd6784.pdfIn PDF document text
    • http://baranaydin.org/3836374911527olk.pdfIn PDF document text
    • https://jeratevi.weebly.com/uploads/1/3/0/7/130774970/vobekukudivuwute.pdfIn PDF document text
    • http://pipawopozovifo.iblogger.org/peter_atkins_quimica_inorganica.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/jadirepuwitizon.pdfIn PDF document text
    • http://car-test.pro/bangsamoro_basic_law_tagalogb42jg.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/wokoponarufadida.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaxisomal.epizy.com/84714168640.pdfIn PDF document text
    • http://nabunuwo.epizy.com/hobbs_and_shaw_parents_guide.pdfIn PDF document text
    • http://gegawuwiru.epizy.com/assamese_sad_love_poem.pdfIn PDF document text
    • http://josotemasafu.rf.gd/sword_art_online_progressive_manga_vol_1.pdfIn PDF document text
    • http://gegavenenuzoba.epizy.com/43212986703.pdfIn PDF document text
    • http://wumuduwowuwi.rf.gd/lewmar_mainsheet_traveler_kit_size_1.pdfIn PDF document text
    • http://mudalulox.epizy.com/acunetix_10._5_full_crack.pdfIn PDF document text
    • http://xuperaletofigaz.epizy.com/what_relationships_can_be_seen_between_living_organisms_in_an_ecosystem.pdfIn PDF document text
    • http://nomekerileme.epizy.com/1488639889.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_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 5536 bytes
SHA-256: be12bb9f892299e22a578907c80fdd427304176dffd2367d5d8e88cbf086915a
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 11104 bytes
SHA-256: 63efa6ff208a7f75caaeed4889fcff4540a17325fc7551106ab0dde1e4139077

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