Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1d3cd840314fc0…

MALICIOUS

PDF

75.8 KB Created: 2021-04-05 08:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8f47e85ec46ecdad5bfb26f6d350a33f SHA-1: c5c336415072f340d79629a92172288f22139979 SHA-256: dd1d3cd840314fc0bd1071714e166e44223bf7dea78905b3b5d0ede1a103c86b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on 'https://golowaki.ru/wix?keyword=best+url+shortener+to+earn+money+in+pakistan'. Heuristics indicate this PDF is a link farm hosted on disposable domains, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the overall structure and URL distribution point to a social engineering attack.

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://golowaki.ru/wix?keyword=best+url+shortener+to+earn+money+in+pakistan PDF link annotation
    • https://cdn.sqhk.co/rotuzuwibi/jaYgidL/campus_dating_sim_ios_hack.pdfIn PDF document text
    • http://vikarevu.22web.org/32802145216.pdfIn PDF document text
    • https://cdn.sqhk.co/rozopebak/jghbgjA/19239799399.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/kEhciel/27140453432.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/G7hgWja/40448664301.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/gjhhghw/poxerofazuxetagemeru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387242/normal_60635b78a2d2f.pdfIn PDF document text
    • http://gelchlen.fun/hotel_booking_software_australia5l90q.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/dhjghie/rugomakusetarowubotule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424672/normal_5fd03b6c87666.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/ijehdid/amazon_flex_driver_app_download_ios.pdfIn PDF document text
    • http://damvglaz1.xyz/hoco_es20_user_guidev9u9p.pdfIn PDF document text
    • https://cdn.sqhk.co/tinukomafiro/ggpjajj/vekajat.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/Lij3Xig/togapegujafutox.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/fefurorobumi/tetamelobikemogajefezin.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/cheap_android_phones_with_great_cameras.pdfIn PDF document text
    • http://jamovame.epizy.com/new_bhojpuri_song_2018_hd_video.pdfIn PDF document text
    • http://givonomiruf.rf.gd/71984817790.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/how_to_use_psychology_in_marketing.pdfIn PDF document text
    • http://setixebasedi.epizy.com/lexefog.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/bangla_natok_jomoj_5_free.pdfIn PDF document text
    • http://jetavepizixe.epizy.com/79842347388.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_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 5272 bytes
SHA-256: e489aa6f8c4718e4489bc8cca22ed89e5a1fd0488182badb9aec1d5616b11c5f
font_01_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 11412 bytes
SHA-256: 5cd28774d536e64808f4e94360f2d35b4b9e1259336a7faf9868f691a8eb5405

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