Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed820fe8e462e6fd…

MALICIOUS

PDF

70.2 KB Created: 2021-02-26 16:57:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcfe733ff9afd54d16c2a37cb0140178 SHA-1: de1b4bf254c0d42d4cd4f3c7f7d57c9d515688e4 SHA-256: ed820fe8e462e6fd78e7e7750dceef697db7491a29d23b4d15275ce1751134c8
156 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 disguised with book-related keywords, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host and present these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=chapter+4+to+kill+a+mockingbird+theme
    • https://cdn.sqhk.co/borefigux/Oje3ih5/dune_movie_2020_feyd.pdf
    • https://cdn.sqhk.co/doxanusubomo/iiVjeij/73618487260.pdf
    • https://kisagisetiduke.weebly.com/uploads/1/3/4/7/134762251/5908057.pdf
    • https://gomadiwisedewun.weebly.com/uploads/1/3/5/3/135314557/rulikatorol.pdf
    • https://zixozuji.weebly.com/uploads/1/3/1/4/131454221/mabikitagemolipomo.pdf
    • https://cdn.sqhk.co/vibisidumes/aLqUMVC/49674493095.pdf
    • https://pomapufawupufus.weebly.com/uploads/1/3/5/3/135397804/pasokuzefof-towaromenowe-sovomebomab.pdf
    • https://cdn.sqhk.co/kalusoxat/ehjsjar/que_es_un_virus_y_ejemplos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tufobiwileke.rf.gd/reporting_concerns_mental_health.pdf
    • https://s3.amazonaws.com/fumiposamisur/jowok.pdf
    • https://s3.amazonaws.com/padosumifubobo/innocentia_idols_solo_performance.pdf
    • https://s3.amazonaws.com/wanalovum/gutachtenstil_bgb_ausformuliert.pdf
    • http://pogifovemujure.epizy.com/abraham_maslow_theory_of_motivation.pdf
    • https://s3.amazonaws.com/tobaziw/86806191216.pdf
    • https://s3.amazonaws.com/nuxepiduded/gajobebusogejuwun.pdf
    • https://s3.amazonaws.com/vezumobigodub/bibliography_format_for_electronic_sources.pdf
    • https://s3.amazonaws.com/xenavuxa/20300734035.pdf
    • https://s3.amazonaws.com/loneminovu/sig_sauer_nightmare_45_review.pdf
    • http://nolumuj.epizy.com/waltz_of_the_flowers_piano_sheet_music.pdf
    • http://jajoditad.rf.gd/gedeckter_apfelkuchen_rhrteig_springform.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_off0000d857.bin
ca105f97e3546674f04367729e838869ff9e59844a66acad7f02f20f1b1fa0c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 5504 bytes
font_01_sfnt_off0000eadd.bin
b4142e1887ad5f929f14952da71d0e557913eca7e194c480c2ff2958ffa5382a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 9452 bytes

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