Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebf5b7f961f3e4a…

MALICIOUS

PDF

87.0 KB Created: 2021-02-24 00:21:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7ef272ce096e850626190b142628cd21 SHA-1: 8ee9b4477363128d22c4fa50f272c17ee2962c66 SHA-256: 7ebf5b7f961f3e4a2001392522ca798529413c64ca404e3685414c57e23dbb4a
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign content, but also includes a suspicious URL associated with a callback phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious content or services.

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jacksth.ru/strik?utm_term=criminal+law+nsw+book PDF link annotation
    • https://cdn.sqhk.co/waxigapo/eKMJhaT/nowejubisozikimapisida.pdfIn PDF document text
    • http://kindraretterath.com/937638475539x310.pdfIn PDF document text
    • https://cdn.sqhk.co/vigeroti/cahdHP0/31350005701.pdfIn PDF document text
    • https://verakolor.weebly.com/uploads/1/3/1/3/131379730/7573461.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/faa480c2f19758.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/whjhghh/crossroads_mall_stores_st_cloud_mn.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/ehdjahh/56649686139.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/napisakaluja/android_saga_vegeta_vs_frieza.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/muvawunelerapenov.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/zutesoloxakesazokidenu.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/html5_new_form_attributes.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/dosusogulakowul.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/19917331255.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/zugupodevolenul.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/chargesheet_online_karnataka.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011fa5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11FA5 25188 bytes
SHA-256: 58acf7a5a1ee6a4b72f2b475eaab710b2c7006eb15ac78391961f7bd763fbbca
font_00_sfnt_off0000e962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 5032 bytes
SHA-256: 47a1d88db6cc9ce27e4b6932f92baa36f686bb3e320d6165b6cd7c3c9da69aa4
font_01_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 10868 bytes
SHA-256: 714bc3f95b234e175f95cf4e47510ec5af2a76064a7c634b542a3a0b07af450a

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