Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0bf26e1e00073d…

MALICIOUS

PDF

77.7 KB Created: 2021-01-15 06:09:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d63ee18081ec790c5d371e66a6c2b04d SHA-1: ec05a7029c7302aab0668f5388ca26afff495181 SHA-256: 4c0bf26e1e00073d5e232ab1fecdef9e4c8a9d24e86737c7474b82a7e8c3a817
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous embedded links, many of which are invisible and designed to trick the user into downloading a payload. The heuristic 'PDF_REPEATED_PAYLOAD_LINK_LURE' specifically identifies these malicious links, with one pointing to 'https://trafficel.ru/123?utm_term=money+bag+yp+time+served+mediafire.com'. The presence of a 'ML_NYX_PDF_MALICIOUS' flag and ClamAV detection further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/123?utm_term=money+bag+yp+time+served+mediafire.com In PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/gdjjigg/gonifatoperuleko.pdfIn PDF document text
    • https://cdn.sqhk.co/siwemawatu/ge1jdhg/60371318670.pdfIn PDF document text
    • https://cdn.sqhk.co/derebeduno/3tbRgcX/11004003106.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/62ijvb9/dark_raider_android_apk.pdfIn PDF document text
    • https://zogugixuwomu.weebly.com/uploads/1/3/4/2/134234599/koxivomego.pdfIn PDF document text
    • https://xadatazibinul.weebly.com/uploads/1/3/1/4/131483053/tamuvuzuzebidaw_kejepale_farosopiwon_surudumo.pdfIn PDF document text
    • https://site-1172290.mozfiles.com/files/1172290/xagamawalawaxarimap.pdfIn PDF document text
    • https://xonedapu.weebly.com/uploads/1/3/4/6/134654428/tuvagimorimede.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/HIigCgc/monster_jam_steel_titans_ps4_review.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/zonebon/update_whatsapp_latest_version_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/47196656271.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/foputufijifemuv.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/chevron_moustache_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/leatherworking_guide_vanilla_trainer.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 5780 bytes
SHA-256: 2e0220eb700db8f7da02ba72978d2d09e595d94dff79ffb3a73d88e50108d73e
font_01_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 11492 bytes
SHA-256: 66a3c22f545a6fd508da8ba31859d0c650624138ae1ae8cf253988db8773e88d
font_02_sfnt_off000114ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EE 16060 bytes
SHA-256: d26390a1b495fc4844790f49287189703365677ecb3af67b7cca25d146cf5ea9

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