Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d491c4bdba3c068…

MALICIOUS

PDF

83.6 KB Created: 2021-02-20 01:34:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a05f0d97f639541946e0962cc75787f4 SHA-1: dd8e39f527ff35c6f4cd7179078c5c8030a0738e SHA-256: 0d491c4bdba3c06834784fc6fee1b8af0292f2cc8ff8997082083db40babf0b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=how+to+write+an+essay+outline+pdf PDF link annotation
    • https://cdn.sqhk.co/mojaribi/ibicIm6/new_ringtone_2019_download_mp3_mr_jatt.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/gisumarefe.pdfIn PDF document text
    • http://vofefipegurixu.iblogger.org/aaruthra_tamil_movie.pdfIn PDF document text
    • http://allfreebets.ru/chopsticks_sheet_music_musescore3ndya.pdfIn PDF document text
    • http://1xbets-regs.site/97292575246rxmzn.pdfIn PDF document text
    • https://nulixosur.weebly.com/uploads/1/3/4/3/134311840/8057120.pdfIn PDF document text
    • https://cdn.sqhk.co/nisisepolo/GjcXghA/dragon_hills_retreat.pdfIn PDF document text
    • http://7gusevshop.website/73810283896piib5.pdfIn PDF document text
    • http://sallely.xyz/believer_sheet_music_with_lyrics9ey8f.pdfIn PDF document text
    • https://jaluburevajag.weebly.com/uploads/1/3/0/8/130874017/4288978.pdfIn PDF document text
    • https://fivilogavizizov.weebly.com/uploads/1/3/4/4/134446089/gomimatazi_vutoruvo.pdfIn PDF document text
    • http://coloradocustomelectric.com/infectonator_survivors_christmas_hacked9pxrh.pdfIn PDF document text
    • https://bagugesi.weebly.com/uploads/1/3/0/7/130775983/juludixojizedo.pdfIn PDF document text
    • http://youla-24.cc/detelusosovotovuwisesi7acki.pdfIn PDF document text
    • http://anarchymedya.com/children_s_nursery_rhymesvdpp0.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://tiworetaganufo.epizy.com/nalexojumowad.pdfIn PDF document text
    • http://texegap.epizy.com/81021270385.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCE 5072 bytes
SHA-256: a3fc58d859f9c3777de8b6f8a6b815fd1179dc4f8c4ce18ee1e8d2985eb03fcf
font_01_sfnt_off00010f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F26 10584 bytes
SHA-256: fb9bb1e4f524fffbab1f0331edd8e6183ff62fe87a4d74a37a4868287addeae2
font_02_sfnt_off0001333b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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