Malicious PDF — malware analysis report

Static analysis result for SHA-256 01bc030bb9558512…

MALICIOUS

PDF

81.9 KB Created: 2021-03-03 23:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6b9591ed624e88528d356b6c5a8e267 SHA-1: 36ec36ae28c5d851282c5a93a1e12996406f945b SHA-256: 01bc030bb955851264aeadd5365e4c9d4377e91ea4efaf90e234dd3747d7434f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or a method to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a potential download or redirection mechanism, possibly leveraging embedded JavaScript within the PDF.

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://crophysi.ru/123?utm_term=oedipus+rex+summary+gradesaver
    • https://cdn.sqhk.co/zuronenom/WLkgjgh/funny_guy_names_for_jokes.pdf
    • https://punoburewi.weebly.com/uploads/1/3/4/3/134305970/ae9f290ac7.pdf
    • https://livesagu.weebly.com/uploads/1/3/1/4/131437401/jajujagis.pdf
    • http://kufafukedexepix.mygamesonline.org/21487178936.pdf
    • http://nokojatagi.mywebcommunity.org/zolulomalajinizudav.pdf
    • http://slimitalia.space/gejijuzosinirabatapezxce1.pdf
    • https://cdn.sqhk.co/ledirevobep/gdCOSoJ/business_management_jobs_salary_in_philippines.pdf
    • https://cdn.sqhk.co/sirejeforox/gCnhbhg/ringtone_download_music_sound.pdf
    • https://fiwigerisen.weebly.com/uploads/1/3/1/4/131408459/sodedotu-tijepa.pdf
    • https://cdn.sqhk.co/wevafofed/6S02IbI/3748774740.pdf
    • http://seplafond.xyz/what_are_the_types_of_wiring_systemedm1k.pdf
    • http://sarhello.online/sony_dvp-cx995v_please_waitfhnn5.pdf
    • http://wapadax.scienceontheweb.net/nivotuvitamo.pdf
    • http://acupofjacob.com/percentage_math_problems_with_solutionseiq5b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off000104d1.bin
a11300d22691092b28e36e759d10fcf0209225075d44072daca14396eb6ccc32
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 5504 bytes
font_01_sfnt_off0001177e.bin
4d250ccb81597b74155c96af45089a47b7969f1fd98145afbb6707ac32cda599
pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 10272 bytes