Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c504a687c94a1e5…

MALICIOUS

PDF

131.0 KB Created: 2021-01-10 07:48:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6c1c920eb6c8ebb02ab37ccb25727709 SHA-1: 95dbb0797545048aab0491169f0c08291d2835fd SHA-256: 9c504a687c94a1e5d335ade5d6e7c6402454818db14d95d38d08ed82ddf10514
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?utm_term=elements+of+literature+fifth+course+pdf PDF link annotation
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/bubobexowipazok_jowogapagoz.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/57995.pdfIn PDF document text
    • https://site-1201991.mozfiles.com/files/1201991/26390267814.pdfIn PDF document text
    • https://site-1166671.mozfiles.com/files/1166671/lokurulumuwajefonivadis.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/lelexofutefe.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/fobuwix.pdfIn PDF document text
    • https://site-1177968.mozfiles.com/files/1177968/kazopezufakuw.pdfIn PDF document text
    • https://raragunaxunu.weebly.com/uploads/1/3/4/8/134886293/4d0b91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/zomobilududakuviropapoz.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/comrade_mao_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/btd_6_apk_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/becoming_michelle_obama_vk.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/lefovarusak.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/hnh_nn_desktop_p.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001895b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1895B 7768 bytes
SHA-256: b11e8f2186220def7a891f77ec102e15c2f5cbfce750d80884dd3b184a1d95f5
font_01_sfnt_off0001a350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A350 5352 bytes
SHA-256: 90538ecf669b084cf2d29845079c1d858632238c5c240d0ec4d926339dba116d
font_02_sfnt_off0001b558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B558 16016 bytes
SHA-256: 29010e2c0542d79c66ce8ec37132fd3898e9127f478527d54b5dee45a4f8399e
font_03_sfnt_off0001e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E712 16568 bytes
SHA-256: 6ebd050c84759c05f8593563d4f3b57e6bee01eea602713dec95bbddb906672e

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