Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf1c90d9d2bfdc4…

MALICIOUS

PDF

86.3 KB Created: 2021-04-28 07:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c64bcd6799916809b394ed1dd59b28a1 SHA-1: 83eb239825d950067aa6845ce1d5e0dfcac6fa8f SHA-256: ecf1c90d9d2bfdc47aef030aa67f06d7279fb53c025cea0ea355c39ac97fab0e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://gimoguvi.ru/strik', which is highly suspicious and likely leads to a phishing or malware distribution site. ClamAV also detected the file as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=al+quran+al+kareem+uthmani+rasmi
    • https://static.s123-cdn-static.com/uploads/4488806/normal_5ffb5be6e18c8.pdf
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/ba2eb1.pdf
    • https://bunogijadijis.weebly.com/uploads/1/3/4/8/134896562/8411946.pdf
    • https://jorimedazaget.weebly.com/uploads/1/3/0/7/130738946/kikijanumotuvik-tafenemime-nikidowaf-fupadirexaf.pdf
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/6f706.pdf
    • https://cdn-cms.f-static.net/uploads/4445743/normal_604f96420e34d.pdf
    • https://komimuvupelogi.weebly.com/uploads/1/3/4/3/134312664/f98bce383a069.pdf
    • https://fuxupetuvifa.weebly.com/uploads/1/3/5/2/135298555/xadugumono.pdf
    • https://zudavarasosala.weebly.com/uploads/1/3/4/2/134266164/tizijofot-lunejonakolita.pdf
    • https://rurovipodi.weebly.com/uploads/1/3/4/0/134096689/mesugajigi-roweji-luruxunulo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zukogi/d_link_dir_615_installation_instructions.pdf
    • https://s3.amazonaws.com/xisefowu/14173775119.pdf
    • https://s3.amazonaws.com/pajeriramal/taveporiropanunogakiku.pdf
    • https://s3.amazonaws.com/jigezilor/carmageddon_reincarnation_patch.pdf
    • https://s3.amazonaws.com/widuxade/sendungen_von_ard_mediathek_en.pdf
    • https://s3.amazonaws.com/zafijukopa/jubijaloxobuvalawazewoxo.pdf
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_fef7235460bf49569369ceb7b2a06885.pdf?index=true
    • https://s3.amazonaws.com/jeworurowam/1007189797.pdf
    • https://s3.amazonaws.com/sazomo/wings_of_fire_book_13_characters.pdf
    • https://s3.amazonaws.com/vavale/14985101341.pdf
    • https://s3.amazonaws.com/potofaw/doraemon_title_song_ringtone.pdf
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_5fde39450a6a4668a0a22f4222a0c947.pdf?index=true
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2af.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 6744 bytes
font_01_sfnt_off0000f396.bin
7729ef1b3831c8ff16d1e6e6402720fb2a8fb87b17efcdcbee0f3b2a514b359d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 5104 bytes
font_02_sfnt_off000104ce.bin
7dc63c6164148bf10f1c23a744d05533ea2cd3c4214011375579f5643af0c7a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 12928 bytes
font_03_sfnt_off00012dc7.bin
ac8b1a1c653c5ee7a77ffe3fa1488265ca4842b33cb5513c37ea4ddbc3f3e881		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC7 18596 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.