Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ed887d3466d10f…

MALICIOUS

PDF

74.9 KB Created: 2021-03-21 09:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18deff92e1a65b1c262d9e4ebdd5beb2 SHA-1: 23470c57cacbec11a90cfe62820f39376f73e27d SHA-256: 48ed887d3466d10fd86a9f1580d32fa8d88de1c1c9896ced50f2d916f8802da8
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or content distribution network for malicious files. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/award?keyword=statistical+inference+via+data+science+pdf
    • https://vadewowiruku.weebly.com/uploads/1/3/1/3/131382700/6816589.pdf
    • https://cdn.sqhk.co/foropogajag/heijhgh/13287523737.pdf
    • http://dabaxetalu.22web.org/77844752241.pdf
    • http://funogager.22web.org/ruwisosobu.pdf
    • https://wuzipagaxu.weebly.com/uploads/1/3/0/7/130776492/raxele.pdf
    • https://cdn.sqhk.co/buzaxelubot/aIjeie5/tigomawarakefuxenimaxo.pdf
    • https://cdn.sqhk.co/pozazoji/iigjjfN/versatile_worker_in_a_sentence.pdf
    • http://mofolaz.22web.org/chahun_main_ya_naa_instrumental_ringtone.pdf
    • https://rixeludabigadak.weebly.com/uploads/1/3/0/9/130969597/2217759.pdf
    • http://besemafobekilir.22web.org/chauffe_eau_thermodynamique_combin_solaire_haute_performance.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xalasawu/bakery_business_plan_examples.pdf
    • https://s3.amazonaws.com/dusubonifu/31302006033.pdf
    • http://totegipokazize.epizy.com/95546836261.pdf
    • http://peromur.epizy.com/pumusava.pdf
    • https://s3.amazonaws.com/kefodek/all_of_me_karaoke.pdf
    • https://s3.amazonaws.com/rodigapigeta/critical_thinking_examples_at_work.pdf
    • https://s3.amazonaws.com/bamepofewalada/sufama.pdf
    • https://s3.amazonaws.com/tuxalowafokuvo/what_are_the_components_of_storytelling.pdf
    • https://s3.amazonaws.com/bupijila/kobabumes.pdf
    • https://s3.amazonaws.com/xumakomowi/birthday_celebrations_around_the_world_worksheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e821.bin
9eb62cfe9f81e53f151fe3bc9214df6dbaf3b7848624f3f47772f61f3333c3e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 5312 bytes
font_01_sfnt_off0000fa4a.bin
238f0f82ed13f9a7eeb262124a9deea1910a07460d3b5133523c96c2e674c1da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 10564 bytes

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