Malicious PDF — malware analysis report

Static analysis result for SHA-256 e451dfa7cdc86fc3…

MALICIOUS

PDF

74.4 KB Created: 2021-03-04 21:13:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00eacbfe47039baedaa208eb3dd62280 SHA-1: df50a41e5eef7ce21c6a23a51f47aa8bba303b32 SHA-256: e451dfa7cdc86fc318fdd4622e631e683ff6e71917651eded9123b39f81e16b1
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 disguised as legitimate documents, suggesting a link farm or phishing attempt. The primary URL, 'https://xajibur.ru/123?utm_term=how+long+does+it+take+to+learn+how+to+weld', is presented as a search result to lure users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://xajibur.ru/123?utm_term=how+long+does+it+take+to+learn+how+to+weld PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5fc71b483fa01.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimofaw/gYhd7gj/nuclear_war_simulation_video.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/ippDsji/centipede_movie_2004.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/fgiha3U/matchington_mansion_levels.pdfIn PDF document text
    • http://kulofokugizadeb.22web.org/78493758333.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/IqiifMd/gaming_monitor_for_xbox_one_x.pdfIn PDF document text
    • https://cdn.sqhk.co/kimorotadopo/8hahhgf/99551009341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_602a017aeec92.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/vifusupegiza/kaniwogek.pdfIn PDF document text
    • http://fizojigijuzad.epizy.com/brasilia_coffee_machine_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/ba_1st_year_geography_book.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_2167f91db1ab467e8ef1b487e78ab134.pdf?index=trueIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_06331f5be03f4b2b8a9b2c720aed9f0c.pdf?index=trueIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_36cefba0b0c54862a545ff127e3b81ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/28615215130.pdfIn PDF document text
    • http://mesujexu.rf.gd/63010517156.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/69735489641.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/88945301634.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/what_is_the_best_budgeting_app_for_android.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 5204 bytes
SHA-256: c239c8b08800fb980716075e635cd878eaf0443a1d42c776f3ee709ae1b5a1e3
font_01_sfnt_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 10904 bytes
SHA-256: fb6527aa2ab5b13ce0b6a609b412487886b161bbd1b21cc93e1e2fd5bf8c6214

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