Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c77ffc86856549…

MALICIOUS

PDF

85.9 KB Created: 2021-03-13 13:07:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c584dd3d60b573242e8b809213e6767d SHA-1: bd754208f6507d90c6c02d3d9f0837522e7d9c02 SHA-256: 88c77ffc868565490915a48cad76a9096404edc2a9c01098485dfd71dd4471cc
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to a book search, likely a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=the+honeymoon+effect+full+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418970/normal_6012a26994226.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/54987302790.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/yigL5u1/41652118763.pdfIn PDF document text
    • http://medgaj.com/juxubedakadapufi6wpi9.pdfIn PDF document text
    • http://idealica-official-it.website/solupukifamawapapanepkzswo.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/fSLQw4k/repuza.pdfIn PDF document text
    • http://natorg.fun/vokesujemomipafurawanogmuy4.pdfIn PDF document text
    • http://detonicufficiale.website/beat_mp3_rhythm_game_apkpuregbnyc.pdfIn PDF document text
    • http://impergamon.com/82260140824521tv.pdfIn PDF document text
    • http://whalesqpa.fun/ham_radio_deluxe_free_windows_10u9mgl.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/roxubozufuja.pdfIn PDF document text
    • http://xejepurefe.scienceontheweb.net/writing_tips_for_ielts_academic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424646/normal_600395e5787c2.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/zjb0jgK/dezatavujukaripafabo.pdfIn PDF document text
    • https://cdn.sqhk.co/rozamulev/dhISzig/bentham_utilitarianism_notes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375358/normal_5fed80d080d62.pdfIn PDF document text
    • http://shoop-fl.ru/free_powerpoint_templatenhkp7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488100/normal_5fd0673e82112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kenozajawatulaw.rf.gd/hackerone_latest_report.pdfIn PDF document text
    • http://lalukegadugubu.epizy.com/4940380168.pdfIn PDF document text
    • http://falowowujozaba.rf.gd/adobe_photoshop_cs5_tutorial_videos_free.pdfIn PDF document text
    • http://fabodatutowew.epizy.com/29162059392.pdfIn PDF document text
    • http://vefelazubogimew.rf.gd/37150403660.pdfIn PDF document text
    • http://viwuwijagabote.myartsonline.com/lekipal.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/53063949737.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 5000 bytes
SHA-256: 0d78bba24bf848b661eb8ab0b947903a5c42bbee4dce3e260ca6dc84f504841b
font_01_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 10992 bytes
SHA-256: 72e952415a13750371c92e577b7dc05e8080921f22a85fd5dd25857f8598167d
font_02_sfnt_off000124c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
font_03_sfnt_off00013988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13988 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f