Malicious PDF — malware analysis report

Static analysis result for SHA-256 e977961fac4354b4…

MALICIOUS

PDF

82.3 KB Created: 2021-02-23 22:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2be7d689b656d28342b157390d09ec80 SHA-1: babab9b8766eb4af53043645c35ad7267edb8a9b SHA-256: e977961fac4354b43aa5de0aef6eb012bbceaced6b366521a6f20947f280f257
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a "keto calculator", likely to entice clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/wix?keyword=healthy+weight+forum+keto+calculator PDF link annotation
    • http://zuluwana.iblogger.org/toponubogopanabilawanovis.pdfIn PDF document text
    • https://wikoxunorature.weebly.com/uploads/1/3/5/9/135968981/napurusixib.pdfIn PDF document text
    • https://mojavopadagesit.weebly.com/uploads/1/3/5/3/135383036/bc3b5b370fb2.pdfIn PDF document text
    • https://medijomozu.weebly.com/uploads/1/3/0/7/130775841/f752833f6708.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450242/normal_60062b2fafe25.pdfIn PDF document text
    • https://dosemawa.weebly.com/uploads/1/3/5/3/135388865/nogofiz-wojokotexeduxu-sibapimexekutod.pdfIn PDF document text
    • https://buxijabis.weebly.com/uploads/1/3/5/3/135329720/jodotofi_lawijoleropovo_zezagatakowiba_kuxetisolopija.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464315/normal_5fcbd127f36d6.pdfIn PDF document text
    • https://cdn.sqhk.co/jefadata/gZgdVdr/fifa_beach_soccer_world_cup_2017_winner.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/benawipowesufetudig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5ff9aa3a3c15d.pdfIn PDF document text
    • https://zitadinenere.weebly.com/uploads/1/3/1/8/131871439/dazipubama-sumukawibij-tuzuvenafiju-zijilati.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/hcJnhgS/digowuvebewilukak.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/jhrji0K/metal_slug_defense_hack_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://riluromeni.epizy.com/pathfinder_interactive_character_sheet.pdfIn PDF document text
    • http://tufukupetateto.epizy.com/dekaron_rising_quest_guide.pdfIn PDF document text
    • http://mowilutom.epizy.com/65942086555.pdfIn PDF document text
    • http://savagit.rf.gd/vuvafukuvisekireminorik.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 5336 bytes
SHA-256: bf4fdd2669eb42af98bf9083f2e320efbffc132b641b8e7a3155c2a24fb1cd66
font_01_sfnt_off000117ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EA 10392 bytes
SHA-256: bec3eb79b1d4561fc6f58c7d3b792cfdaa42a16a80ffd3513540dba7125c32ba

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