Malicious PDF — malware analysis report

Static analysis result for SHA-256 437cb62fa0dd017c…

MALICIOUS

PDF

76.7 KB Created: 2021-04-03 06:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f74a637f993b4d7e4bea5c096bf9f9f2 SHA-1: 2893bbb4c0ff1f5bc6fc5788f3851bf2c7ba1331 SHA-256: 437cb62fa0dd017c85c6615427e3a9163808bbc39f88755038318d2d91f5b389
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or a method to redirect users to malicious content. The document body, though partially corrupted, contains a title related to unjamming a Ryobi nail gun, which is likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=how+to+unjam+a+ryobi+nail+gun
    • https://cdn.sqhk.co/xidafigutoxa/jh3RhjL/vafukabuwidowulivovigolil.pdf
    • https://cdn.sqhk.co/xovatagemi/0jjkZgi/masipumumesipibivirem.pdf
    • https://widewosum.weebly.com/uploads/1/3/0/7/130775244/c1dc26688eaa83.pdf
    • https://tureduritisamo.weebly.com/uploads/1/3/4/6/134676104/7329426.pdf
    • https://cdn.sqhk.co/dogojaseziwo/jgCQKWa/bexopulab.pdf
    • https://cdn.sqhk.co/tamaladafa/gchaWjb/71978240281.pdf
    • https://cdn.sqhk.co/xenotami/VHAX6GL/liverpool_fc_live_wallpaper_for_android.pdf
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/jezit-sotatinakojam.pdf
    • https://poxapoxidofex.weebly.com/uploads/1/3/4/0/134016688/mubigurel.pdf
    • http://gexopidikimo.mygamesonline.org/boxenezibazelexu.pdf
    • http://wimixolumow.iblogger.org/how_to_turn_on_a_rain_bird_sprinkler_system.pdf
    • https://nojamatisi.weebly.com/uploads/1/3/1/3/131384142/3208922.pdf
    • http://lezirumari.sportsontheweb.net/9185028091.pdf
    • https://cdn.sqhk.co/jilebodetifa/Xgh0ggi/xexewuwavagedegevomigen.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bejewidokani.rf.gd/52178783992.pdf
    • http://setiwifuv.rf.gd/52366625505.pdf
    • http://gixopiv.onlinewebshop.net/63568884696.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_off0000e81d.bin
c99608701a7306fb1f16c1958c28c4a84e59378028c34788f79fa0e1f4c540c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 1724 bytes
font_01_sfnt_off0000f0a8.bin
4f83e42a251d884ab9e8faf0eb28957e72bb2c2504fdfab29b11ee6d499ef427		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 5196 bytes
font_02_sfnt_off0001025d.bin
0b11948106d5561afd5aaf50207b171420d37142f6ea2d6cd049cff17bec230a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 10188 bytes

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