Malicious PDF — malware analysis report

Static analysis result for SHA-256 592a2dfa06252c4f…

MALICIOUS

PDF

80.4 KB Created: 2021-03-19 02:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7838fd870775abdf5ea36fa64d38ba15 SHA-1: 48a2d140b8037ab5d9d05c1cfefbe20a2d936369 SHA-256: 592a2dfa06252c4f4dfc69c304606613f78cd3e0cdbf4dca437194e9007d8f56
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a high number of external links, many pointing to PDF files hosted on services like Weebly and S3, suggesting a link farm or content distribution network for malicious payloads. The document body is heavily obfuscated and appears to be a lure related to a fireplace manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 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.
  • 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=appalachian+stove+gas+fireplace+manual PDF link annotation
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/1847574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_602e7ac0a73a5.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/4544996.pdfIn PDF document text
    • http://nuwojukow.mygamesonline.org/63967424658.pdfIn PDF document text
    • https://cdn.sqhk.co/lokemoxire/ihff1je/54398725725.pdfIn PDF document text
    • http://didazema.mypressonline.com/ti-30xs_multiview_calculator_manual.pdfIn PDF document text
    • https://mavipevawifuduv.weebly.com/uploads/1/3/4/5/134598931/novaxotun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388276/normal_5fe05d2b0fbb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373304/normal_5ff2d84ac078e.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/dmRijic/binodefur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454047/normal_605312d0ddae6.pdfIn PDF document text
    • https://cdn.sqhk.co/berovanova/jangcc1/android_data_binding_bindingadapter.pdfIn PDF document text
    • https://funavekun.weebly.com/uploads/1/3/0/9/130969801/fenibaxeze-kevidoduzoxag-fejow-paviwawe.pdfIn PDF document text
    • https://zegaturivelegob.weebly.com/uploads/1/3/1/4/131437779/6681718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454056/normal_6047b9c160eee.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/supefujoxopubu/dark_souls_3_crystal_sage_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/mixavisijis.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/sisadugalufakalux.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/vanatimo.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/girawaj.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/a_train_9_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/is_pokemon_lets_go_playable_on_switch_lite.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/linajepiwimixin.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/white_christmas_movie_song_snow.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/rokisedotosebetew.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/56771430026.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_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 5476 bytes
SHA-256: c9560bbeaf977353ef8adcc073adf06804f1c20afbde13a07d491d8997afb0e5
font_01_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 11156 bytes
SHA-256: cc40d89e32f338d30ad4a1931cef6d444492f4227092265022656c82dc616a6e

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