Malicious PDF — malware analysis report

Static analysis result for SHA-256 c705d3b54239d408…

MALICIOUS

PDF

72.4 KB Created: 2021-03-16 16:52:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c346ae8f2233086b6613029b8ef783d1 SHA-1: f0c527f93b4019c220fd0eb70e33ef4dd065d256 SHA-256: c705d3b54239d408cda684c12a1ae1b07a9673279d60a357635f83d1c40e45ba
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable hosting, suggesting it is part of a link farm designed to drive traffic or host phishing content. The embedded URLs and the document body, though obfuscated, suggest a lure related to Excel formatting to encourage clicks on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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/123?utm_term=excel+bedingte+formatierung+wenn+bestimmtes+datum PDF link annotation
    • https://cdn.sqhk.co/lilokimoz/fkthbt9/32357242833.pdfIn PDF document text
    • https://cdn.sqhk.co/jipodipotaj/4Khb7j3/41042334486.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/24378365569eds7r.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/9p0idQC/tawna_crash_bandicoot_redesign.pdfIn PDF document text
    • http://livethailand.fun/dog_balloon_drawingty5zk.pdfIn PDF document text
    • https://cdn.sqhk.co/logenuzupug/2ifzhbT/agri_ramayan_video_free.pdfIn PDF document text
    • https://cdn.sqhk.co/letojeka/aDthbrn/best_90s_dance_music_playlist.pdfIn PDF document text
    • https://cdn.sqhk.co/manowipete/iiWt6if/96474023627.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/ThfC5ja/wishlist_online_shopping_south_africa.pdfIn PDF document text
    • http://huseyincanx.com/whats_critical_literacypo2kd.pdfIn PDF document text
    • http://adr-media.work/anime_girl_wallpaper_hd_4knhp83.pdfIn PDF document text
    • https://cdn.sqhk.co/siloneza/jbwqSjf/fezub.pdfIn PDF document text
    • http://usacarins.com/4th_grade_math_book_2020tf60z.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/hhrgcha/electrical_symbols_chart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_1719512135c24ee0a11c2b58e0bfa7ad.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_606aeb10b4d14f2287cd1da515363108.pdf?index=trueIn PDF document text
    • https://e518440a-9440-458f-9a08-48a017ad8d08.filesusr.com/ugd/bca722_9ebdc4d7d30342b7810799acf150a70e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/xetosiwedo.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/89411228819.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/sovagaz.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_725e080f978a4f5e8f157bec904b1b93.pdf?index=trueIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_2c401851a62140da9d1676997c9768b8.pdf?index=trueIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_7f655dfcdf5e4f0b80bc0590c70754e4.pdf?index=trueIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_00cdf0c15af94c938a32fb6d760e6e8f.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_a6893da21c4a455c8ad4d27d3fb07f40.pdf?index=trueIn 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_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 5600 bytes
SHA-256: f92e44220df5da42013f52759ab45baf79d3967f653a4c7feff51a805b19e767
font_01_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 11548 bytes
SHA-256: 46e9cd8e93f17997bca1d9803be94bc8239cfa6098793e485531477c9017b727