Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91a28784f02d6b4…

MALICIOUS

PDF

77.1 KB Created: 2021-03-11 22:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 382d02e8a5e2964e9b7f17c671959e3e SHA-1: d2f8c34340014bc1d435cf7a669326136bc93a54 SHA-256: a91a28784f02d6b455252c65a72d01651bacee5c0e98a835d4dd1cbbae982f52
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with the primary one being `https://xezojetit.ru/123?utm_term=email+signature+templates+free++outlook`. The presence of PDF-specific heuristics like `PDF_URI` and `EMBEDDED_URL` suggests the document is designed to redirect users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=email+signature+templates+free++outlook
    • https://cdn-cms.f-static.net/uploads/4374545/normal_601ff22e7d75e.pdf
    • https://static.s123-cdn-static.com/uploads/4421966/normal_5ff25de907f9d.pdf
    • http://xefawojuj.mygamesonline.org/reading_comprehension_test_grade_8.pdf
    • https://static.s123-cdn-static.com/uploads/4494868/normal_5fc955458e896.pdf
    • http://nijaxubazaziw.mypressonline.com/batman_death_in_the_family_2020_hbo_max.pdf
    • http://my-favshopf.online/formula_1_2020_xbox_one_asdam2w01.pdf
    • https://cdn-cms.f-static.net/uploads/4491153/normal_6017bd6257097.pdf
    • http://belkwigs.com/92423315112bgz93.pdf
    • https://cdn-cms.f-static.net/uploads/4409113/normal_6031acedea242.pdf
    • http://giveaway2020.info/vamedobimalesekenodosojib5j.pdf
    • https://static.s123-cdn-static.com/uploads/4370269/normal_5fedc2b15207c.pdf
    • https://cdn-cms.f-static.net/uploads/4420604/normal_6015da8c4c59c.pdf
    • https://cdn-cms.f-static.net/uploads/4473919/normal_6016b41dc8366.pdf
    • https://cdn-cms.f-static.net/uploads/4470401/normal_6011852f3982c.pdf
    • http://lagejarejitog.mypressonline.com/sbi_personal_accident_insurance_policy_proposal_form.pdf
    • https://cdn-cms.f-static.net/uploads/4375209/normal_601bfd2777900.pdf
    • https://cdn-cms.f-static.net/uploads/4468550/normal_6029cbcbaa75f.pdf
    • https://cdn-cms.f-static.net/uploads/4388421/normal_60173a750adca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ec23df22-db44-47c0-99f9-3ccd0c3485c9/annihilation_book_ending_explained.pdf
    • https://uploads.strikinglycdn.com/files/3fb57d61-feae-46e0-b9a0-4c06faae2766/kimukasumekasatufejukolor.pdf
    • https://uploads.strikinglycdn.com/files/9c0b5f04-bc3d-4fec-ab91-57f61955ae6e/i_heard_you_paint_houses_movie_review.pdf
    • http://fijorolur.myartsonline.com/nuwela.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f114.bin
d633b734a75d13ef34aefc76c8fe8de5c3140deba32d9d8809e49b41d1480f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 5240 bytes
font_01_sfnt_off000102d6.bin
1d4ff8fc40b81d5ed665314db711c908bc71361abe7d616aa3502eec464fb5b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 10480 bytes

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