Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa50cf58ac8cb4d1…

MALICIOUS

PDF

82.3 KB Created: 2021-05-05 21:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee79b9e935e1243306236675ab7e2f7e SHA-1: 16f28e1cf25f57eb8078182bdcfd70bd63af7e6e SHA-256: fa50cf58ac8cb4d1bfc65c3f905cc758e52663bb99c03aa6726fd13cfb2d4412
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services or file-sharing platforms, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/strik?utm_term=nextbook+10.1+tablet+that+won%2527t+turn+on
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/61f1882d6563.pdf
    • https://static.s123-cdn-static.com/uploads/4459028/normal_5fc5dba2c6a5d.pdf
    • http://cadenalia.com/java_8_parallel_stream_map_example7xbve.pdf
    • https://watogovujun.weebly.com/uploads/1/3/4/6/134626060/7589348.pdf
    • https://cdn-cms.f-static.net/uploads/4446263/normal_604b7f6a6a881.pdf
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/wunikuxajuk_xejojugafut_fenide.pdf
    • https://cdn-cms.f-static.net/uploads/4476577/normal_6040da8c5d19a.pdf
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/a896e4a109ccd2d.pdf
    • https://damoleruli.weebly.com/uploads/1/3/0/7/130776580/puliwunep.pdf
    • https://geputugu.weebly.com/uploads/1/3/5/3/135311163/8201952.pdf
    • http://aycotoro5.xyz/28817396148grgaj.pdf
    • https://vimitorumu.weebly.com/uploads/1/3/0/8/130814921/8953659.pdf
    • http://fullhp.info/rebojicaecb.pdf
    • https://wotewaga.weebly.com/uploads/1/3/4/6/134615540/dajebux.pdf
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fdd30e924bd3.pdf
    • https://govoxarenaja.weebly.com/uploads/1/3/4/8/134874143/nirixedax-degojekujeji.pdf
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5fe63397883d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xisakazelelinim/amazon_music_to_my_phone.pdf
    • https://s3.amazonaws.com/bitajemisajoz/cantaloupe_island_piano_sheet.pdf
    • https://s3.amazonaws.com/gazivemon/tipos_de_anomalias_cromosomicas.pdf
    • https://s3.amazonaws.com/farezelof/argumentative_text_example.pdf
    • https://s3.amazonaws.com/padadutiseni/dafuwofefu.pdf
    • https://s3.amazonaws.com/jupudizadid/ged_social_studies_practice_test_2020.pdf
    • https://s3.amazonaws.com/nimuwet/is_fire_uchigatana_good.pdf
    • https://s3.amazonaws.com/najipavez/email_icloud_on_android.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e1.bin
2eed8d8b47530163ee55ab36c7171e029b0c4a61d41d162806ff018b19d791b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 5024 bytes
font_01_sfnt_off0001060d.bin
2e3249f24094d4db890f86fdfbaf80e18ad1ab049c19ea23e4f80f62be53b7ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 11540 bytes
font_02_sfnt_off00012d55.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D55 4324 bytes

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