Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb17d1901e5b3582…

MALICIOUS

PDF

70.6 KB Created: 2021-03-17 01:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e608b6f5378918a94a6db29a117955d6 SHA-1: e8cd4da7241b3ebacc8718a457eea938bcc46086 SHA-256: bb17d1901e5b3582ecbaadd778d9ad0182106d5d93848ecf4472f83cbb3a6371
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to 'https://maypoin.ru/123?utm_term=cheap+thrills+instrumental+ringtone', suggesting a phishing or malicious redirection attempt. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the ML classifier's high confidence score support the malicious classification.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=cheap+thrills+instrumental+ringtone
    • https://static.s123-cdn-static.com/uploads/4470223/normal_5fc7019792cbf.pdf
    • http://bojidodug.iblogger.org/72316312517.pdf
    • http://zinefikitozozeg.sportsontheweb.net/development_economics_book.pdf
    • http://fejekadiwoxobiz.getenjoyment.net/polerexopusijelagura.pdf
    • http://zukilobuzoroko.66ghz.com/sipahi_bhojpuri_song_2017.pdf
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/4721935.pdf
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/zalowev.pdf
    • https://static.s123-cdn-static.com/uploads/4449000/normal_5feba0afcea3b.pdf
    • https://static.s123-cdn-static.com/uploads/4408346/normal_6003d29fe6178.pdf
    • https://cdn-cms.f-static.net/uploads/4452389/normal_600b461862d7c.pdf
    • https://static.s123-cdn-static.com/uploads/4419218/normal_60003e897a24e.pdf
    • http://xafopawiki.medianewsonline.com/64805601347.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wazorixekunafob/best_decaf_coffee_consumer_reports.pdf
    • https://s3.amazonaws.com/wewuxuviwar/tajunepanirixodafenoteja.pdf
    • http://laxuzoto.onlinewebshop.net/29735670696.pdf
    • https://s3.amazonaws.com/masevewi/mepefike.pdf
    • http://kuxomexepus.epizy.com/children_s_halloween_mask_templates.pdf
    • https://s3.amazonaws.com/petikamov/chandu_telugu_movie_free.pdf
    • https://s3.amazonaws.com/gomakobez/how_to_open_a_locked_whirlpool_washing_machine_door.pdf
    • http://kilizamigikulut.epizy.com/tok_questions_on_perception.pdf
    • https://s3.amazonaws.com/tugafebip/michelin_guide_vert_vietnam.pdf
    • https://s3.amazonaws.com/kegovev/jotojopebudojavobuzisuped.pdf
    • https://s3.amazonaws.com/kifutizijebuj/18391405582.pdf
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cac5.bin
8f52519d2cdf9f570fd9e6b791a19ae1111ea67c4af8762997e0e6c0aeb5dec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC5 3516 bytes
font_01_sfnt_off0000d758.bin
df59746e079ec2424bf66f32727fa7c88daa7f7868320a76be0dd7359d14040c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 5136 bytes
font_02_sfnt_off0000e89d.bin
4532fc196b64625a67c783802ac051de8d51cc30bcdc3eaa6606d22dc486c479		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 10560 bytes

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