Malicious PDF — malware analysis report

Static analysis result for SHA-256 9183319ed66b7f37…

MALICIOUS

PDF

79.4 KB Created: 2021-03-15 22:06:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 62333f8cb3567d45b4fc9a91502f38d2 SHA-1: 603fb56b9460a1a4285f49adb88d1b3ad48dafcd SHA-256: 9183319ed66b7f373950f2802e183df17ad2837eb33a6bb94400b98bd872d35a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary external URIs, 'https://mezovuduw.ru/123?utm_term=breakup+couple+pic', is likely a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/123?utm_term=breakup+couple+pic PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374189/normal_5fe00ad51b863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_6042d0ad6cadf.pdfIn PDF document text
    • http://select-get.top/dojupikevuzosaxuxpj62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422890/normal_5fde8fa96297f.pdfIn PDF document text
    • http://prosale.company/359828323474jwvt.pdfIn PDF document text
    • http://kinokaiff.space/cell_wars_level_207rta9i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_600dcf1760adb.pdfIn PDF document text
    • http://dwatches.site/integrated_chinese_simplified_characters_workbook_level_1_part_1g2my2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427514/normal_5fddcb3837b8f.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/zubuwujoxom/wound_infection_antibiotic_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/ccat_audit_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/rabetolamo.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/70678457493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26215554-374a-4744-b72a-25bc62aaa314/tomenalugirajudis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46e4822-862c-4b2b-8e67-bfa1beb18e80/the_makers_diet_revolution_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ed6dc57-f1f4-4951-94c5-d6a1ddf97f9c/27526413515.pdfIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_4bdf57ab742c4afdaab8005a04e9693c.pdf?index=trueIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_de5647983707475380256fa68dd46aad.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_cfecbe028fff445193261850fe961ff1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/aaina_movie_1993.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_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 4864 bytes
SHA-256: 1e794e12b69d89d08869d0aadc7a8ce0970394a3b866cac7cc594003c87aa063
font_01_sfnt_off00010adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 10932 bytes
SHA-256: 2d042b4d56f4040b6ec30135c28d8e13370077799d9fc64022bdbae1d9a65181

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