Malicious PDF — malware analysis report

Static analysis result for SHA-256 f728832eb7caf373…

MALICIOUS

PDF

76.4 KB Created: 2021-02-23 20:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 406038607fd86fa5805191366822decf SHA-1: 64e039c192b8211b4d10904073884abe77aab253 SHA-256: f728832eb7caf37376ddfa67f457f836471b1b1ca023f2e026784e4c4e2a8660
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://leonvi.ru/123?utm_term=bob+revolution+flex+duallie+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421477/normal_6032f0912edc7.pdfIn PDF document text
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/437ddf6a11f900b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471236/normal_5fede90c33a0d.pdfIn PDF document text
    • https://puwegamojone.weebly.com/uploads/1/3/4/7/134702565/waxuku-xelonewida.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/jhjjLQF/wood_project_ideas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413013/normal_600da30e7aa3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371809/normal_5fddfa993f80e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447097/normal_5fe41fb7474d1.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/6WieuYj/load_wallet_smart_gcash.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/lefudagugijuvisus.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/bezegoluzose/suliwumunikivuvigibowefur.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/guider_publication_math_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/counter_strike_1._6_bots.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/video_er_for_facebook_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/69863135382.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/nichd_guidelines_fetal_monitoring_tachysystole.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/alemite_oil_pump_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/mozilla_firefox_52_offline_installer_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/86205708485.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_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 5172 bytes
SHA-256: 746a99a73edcdd9ce3ec40f4881937b5542459cc0293ff0632afc5f6f81779af
font_01_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 10104 bytes
SHA-256: 453084f9f8d446a10f50c66e9601856b3644c25fffa807e05a1c81708d60347c

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