Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c12bdfcb126f78f…

MALICIOUS

PDF

75.1 KB Created: 2021-06-06 01:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3bb33303224826a8b73bdb2cace57095 SHA-1: 6e1337f20208416aac12f6b88ec02fd29d5ed31b SHA-256: 6c12bdfcb126f78fb65f7a5bceb804e3696f2c29c9ae98683bfe942acaee7d59
186 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 0.9960

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://irlanc.ru/pbw?utm_term=persona+5+piano+sheet+music+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375361/normal_5fd7ea14bec3f.pdfIn PDF document text
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/zodavol-zodajaxemakij-kifirakuwosem-fidatuwiv.pdfIn PDF document text
    • https://nawixelufa.weebly.com/uploads/1/3/5/3/135317770/wikile.pdfIn PDF document text
    • https://vajawopi.weebly.com/uploads/1/3/4/5/134597817/lewupipobob.pdfIn PDF document text
    • https://fofelopuvamugav.weebly.com/uploads/1/3/4/7/134716477/gopeje.pdfIn PDF document text
    • https://bivupiduxod.weebly.com/uploads/1/3/4/6/134664268/jiwok-duveto-bijomojojuk-zonutarukepeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_601f70f4d2828.pdfIn PDF document text
    • https://gekojufoj.weebly.com/uploads/1/3/4/4/134438070/1129706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479675/normal_604da0aa465ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367925/normal_5fe2167d2de26.pdfIn PDF document text
    • https://vozutububedem.weebly.com/uploads/1/3/4/3/134372478/ef89147e.pdfIn PDF document text
    • https://burazukukoxuvi.weebly.com/uploads/1/3/4/0/134096138/nukipirukogudaf-fogolelifiboti-suvud.pdfIn PDF document text
    • https://nawobelif.weebly.com/uploads/1/3/5/3/135307193/3448994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481291/normal_6065d1a30400d.pdfIn PDF document text
    • https://biwozatilajatem.weebly.com/uploads/1/3/4/6/134636438/710638.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_60069de9796b5.pdfIn PDF document text
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/1592464.pdfIn PDF document text
    • https://nufivinob.weebly.com/uploads/1/3/4/6/134682897/nurasojawekivamidiku.pdfIn PDF document text
    • https://tepukijamuboze.weebly.com/uploads/1/3/5/3/135301813/7961126.pdfIn PDF document text
    • https://borubonaxufiza.weebly.com/uploads/1/3/5/3/135318051/linezobaxadeduwidu.pdfIn PDF document text
    • https://gaparomid.weebly.com/uploads/1/3/4/6/134632142/5906050.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef2e0a7-efcf-4b9a-b802-67639da86d28/is_the_galaxy_note_3_still_a_good_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/693664e1-641f-4eeb-9c4a-08dc980bc1c7/93308104855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38aed57-3929-4260-8c21-c7b6aeb8d1cd/what_does_a_baby_grand_piano_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d60603f-d718-4e3f-9e8d-227c7edcf8c9/gelimojedizavuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115da4f5-4636-4b77-908c-465c4bd94eb4/whirlpool_cabrio_dryer_error_codes_e1_f3.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 5488 bytes
SHA-256: c7ec1a026884483bfd3fb2691a790978b284736c5362204596ab3b5416a9e4b9
font_01_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 10708 bytes
SHA-256: 964ddccd7bd675cdfa0c52dc424a10269636db290196a1596b59561f76b31b69