Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d06b0814ddae4f…

MALICIOUS

PDF

65.3 KB Created: 2021-01-21 14:08:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d370840a0e6c1ccc8aa878f793605ee SHA-1: d17e91f465b400a510c7764ce0ac6eb281579b59 SHA-256: b1d06b0814ddae4ff1420088482905ba112b68c40f029d3f6caf0b92bdb5c653
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were extracted, the heuristic firings point to the document's primary function being to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gettraff.ru/aws?utm_term=aphasia+activities+pdf
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/jafisowigemoj-monabasutisopo-juvitu.pdf
    • https://cdn.sqhk.co/xolovagi/ggijL9H/ninja_air_fryer_toaster_oven_combo.pdf
    • https://cdn.sqhk.co/nawafoxobok/hdijzHx/rifupinu.pdf
    • https://botoriki.weebly.com/uploads/1/3/2/6/132682976/74910d44e7eea.pdf
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/keletojaxez.pdf
    • https://cdn.sqhk.co/zivuzigup/11GiEHr/screen_timer_app_for_android.pdf
    • https://cdn.sqhk.co/dogutadova/sbhhhg8/jilasatuketujenesasaxiviz.pdf
    • https://guxemufisi.weebly.com/uploads/1/3/2/7/132710659/6074456.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xitirinajeki.epizy.com/absence_excuse_letter_template.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/dowolemibisajepituwud.pdf
    • https://s3.amazonaws.com/jubiferekaka/company_profile_template_slideshare.pdf
    • http://wepezip.epizy.com/android_app_store_screenshot_sizes.pdf
    • https://s3.amazonaws.com/sojaxub/98848564906.pdf
    • https://s3.amazonaws.com/wulotugadag/tamilrockers_2019_new_movies_malayalam.pdf
    • http://xajumin.epizy.com/bebekesajo.pdf
    • http://sojisij.epizy.com/javascript_blob.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adaf.bin
724e1c385940e5d1c75639471e4173e166c4089543600f9860f7c12fc571d5db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADAF 3800 bytes
font_01_sfnt_off0000bb37.bin
baf0edcfb9b935e65f722bcc04ef21a3e7304ad46ff640f33705e764bf2d9187		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB37 4736 bytes
font_02_sfnt_off0000cb5b.bin
f51e080707c9aca50c3643eee3a6cb36e93689cbf3b681120bd0fe02d8832a3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5B 9028 bytes
font_03_sfnt_off0000ea1b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 4324 bytes

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