Malicious PDF — malware analysis report

Static analysis result for SHA-256 3911eedcb10ed9ec…

MALICIOUS

PDF

80.5 KB Created: 2021-02-14 11:38:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 30a03cb09cbc81e2a076149c4b85afcc SHA-1: f79b7675b276da7307c658e11d378897ebd90fce SHA-256: 3911eedcb10ed9ec87425a2cd26446ea4351ce878ba5502903770895860c0359
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'jottigo.ru', which is flagged as a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a theme of 'names with double meaning', likely a lure. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=nombres+con+doble+sentido+no+groseros PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426422/normal_5ff66f8220022.pdfIn PDF document text
    • http://gikepefizera.22web.org/best_free_photo_collage_app_android.pdfIn PDF document text
    • http://zexawil.22web.org/kulurerufurejaloso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450870/normal_60270c143a359.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496151/normal_5ff6584e35870.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419857/normal_5fee95c632e33.pdfIn PDF document text
    • http://dubiniba.iblogger.org/ark_survival_evolved_mod_pack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5feb2a2f4169d.pdfIn PDF document text
    • http://salejozokaboruz.22web.org/anime_slayer_apk_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_6021e95c6d84b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501193/normal_5fde11b5e4e00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390068/normal_5fca80a6560c3.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/fifomi/10582921323.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/tiwedusevameturine.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/true_caller_id_apps_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/the_bleacher_report_aew.pdfIn PDF document text
    • http://nozuwodapa.epizy.com/bejividesiwamepevusujimi.pdfIn PDF document text
    • http://midowuvebadol.rf.gd/here_i_am_lord_piano_sheet_music.pdfIn PDF document text
    • http://tevisub.rf.gd/incremental_sheet_forming_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/buderus_gb142_owners_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 5160 bytes
SHA-256: 17188e32153bacfe7947d0a52b3733535afa5c99208e757e506f39ea356510c2
font_01_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 14944 bytes
SHA-256: e591abfd852902dc84ac56f4942baef67c81a62d02cab69edebb4be70429de03
font_02_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e

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