Malicious PDF — malware analysis report

Static analysis result for SHA-256 f140dc2e78a02171…

MALICIOUS

PDF

77.8 KB Created: 2021-04-03 02:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abda2021ccf57aa6056b29309581539c SHA-1: de2be908bb524421f595b8dc7cb74063c3267b77 SHA-256: f140dc2e78a021711c7ce631b15d65fea86e4dad6b392418cb41d4fae7b354bf
196 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 suspicious, suggesting a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM and SE_LOLBIN_RUN_COMMAND firings indicate a deliberate attempt to host numerous external links. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a lure for users to visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://ponafet.ru/strik?utm_term=new+video+games+2021+ps4
    • http://autoport76.online/millermatic_135_gunkr925.pdf
    • https://jomaredavox.weebly.com/uploads/1/3/2/3/132302995/vekefusasititokezi.pdf
    • https://mazogerivajusem.weebly.com/uploads/1/3/4/3/134341978/mikawajiwopas.pdf
    • https://mumizovis.weebly.com/uploads/1/3/4/3/134350635/roxaxona-votoxibetarosov-molutarodosik-torivezidor.pdf
    • http://straponartist.com/are_you_with_me_country_song_lyricsumsf3.pdf
    • http://roxelejabojafe.scienceontheweb.net/can_i_use_curl_products_on_straight_hair.pdf
    • http://findfreegirl.com/muzosoboputifolap72du1.pdf
    • http://tesocoin.online/jobopugesokerigojebowixuv3ow3m.pdf
    • http://jolovomolosubi.getenjoyment.net/jalamoninejoripojuperigu.pdf
    • http://50offshop.pro/79406840666lnslq.pdf
    • http://xevijojikutep.onli
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wuzalugiseto/afunika_piki_piki_skirt_mp4.pdf
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_54085fd7fd074d9bb833c41d924d9115.pdf?index=true
    • http://nibubatovavav.atwebpages.com/50950203265.pdf
    • https://s3.amazonaws.com/polexebuj/buxalobisivarojabuwepuxen.pdf
    • https://s3.amazonaws.com/dixaleko/5839156197.pdf
    • https://s3.amazonaws.com/gazivemon/windows_10_64_bit_pre_activated.pdf
    • https://s3.amazonaws.com/mexijegedakol/61515158309.pdf
    • http://zepizevut.atwebpages.com/46981644453.pdf
    • https://s3.amazonaws.com/zeworibuzoza/cycle_helmet_fitting_guide.pdf
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_8fe729a907954f20abbbdcddb3f814fc.pdf?index=true
    • https://s3.amazonaws.com/jupoti/lakefolamuvawujajupi.pdf
    • http://xevijojikutep.onlinewebshop.net/xikowakuwegumudiko.pdf
    • https://s3.amazonaws.com/mokuwanibof/android_set_adjustviewbounds_programmatically.pdf
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_89685fbff9714e51a3e8825229ff3478.pdf?index=true
    • https://s3.amazonaws.com/fedufiporara/sejexup.pdf
    • https://s3.amazonaws.com/gofilafixu/ant_life_cycle_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_off0000f17d.bin
deb803a69d02dbbabe7e4bdd2a651e15f4cd66f64a4f89bf1a49d331dad0bcbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 5688 bytes
font_01_sfnt_off000104fa.bin
ba3178320f1a3cf48c937f8e09ba2eb95c6becf0801a33e65a9dcf873d454278		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 10852 bytes

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