Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f691e2ac903061…

MALICIOUS

PDF

90.8 KB Created: 2021-03-24 09:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6c8ba5eb7e26d844ab077a1135bdfd4a SHA-1: b8bc265b7182adaebbb1b57c47ea2b4716f63bc5 SHA-256: a7f691e2ac9030617f10bc9d10b8743fc3b07ff410f3599b23e7b12f889f85e2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are likely intended to direct users to malicious websites. The heuristic PDF_SEO_LINK_FARM and the presence of an external URI pointing to 'druttle.ru' strongly suggest a phishing or SEO poisoning attack. ClamAV also detected this as Pdf.Phishing.Trojan, further supporting a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/award?keyword=belajar+coding+python+pdf PDF link annotation
    • http://callipakk2.site/soxum23hpe.pdfIn PDF document text
    • http://saleproducts.pro/8045954393q4qt5.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/02eed8b7-3cea-4c04-9084-8f13cb6c19e2/54288081713.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/30622541456.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/bbmku_ac_admit_card.pdfIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_68995cb943cf4c20a3ff6ea88716b1eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/livuno.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/bioresorbable_collagen_membranes_for_guided_bone_regeneration.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/power_wheels_escalade_ext.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_3d073508d6934e2ea4c9a0ff179be6cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wajibile/60268155901.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/how_to_get_business_loan_from_bank_in_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/power_electronics_music.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_4f87348f72134a0b8b8edab6d0faa956.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1da30b3e-fc0e-4cb1-b9e6-6edd5053eb38/how_much_do_graphic_designers_get_paid_per_hour.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/vofolatupud.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_2f2f8530854f47a8b5b2ad565dc818eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/foguterivog.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/aplaceformom_employee_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/basic_electroencephalography.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/dojes.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/17613765677.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_off0001252d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252D 5464 bytes
SHA-256: e1dc831a3b11ebfda35ad5a498e9089d6a2950441bc6e00eb0458546514d0fb0
font_01_sfnt_off000137d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D3 11184 bytes
SHA-256: c2433deb1fe996c78bef6356bf16d9a44b42fc386d025defda4b5ad41082ea8a

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