Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70ff7b48654aa0e…

MALICIOUS

PDF

80.2 KB Created: 2021-03-02 03:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 256d1641e2d87753fa0358c224393759 SHA-1: 3ac09c6a3a396ae2ef10d62c915c540daee0250c SHA-256: a70ff7b48654aa0ee724b8a237c34cbc9ef98c5f2b7d8c2c535dead049fe12c1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, with a significant heuristic firing indicating a mass external PDF link farm. The document body, though heavily obfuscated, suggests a lure related to game content, likely to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=dark+souls+2+can%2527t+use+gold+pine+resin PDF link annotation
    • https://cdn.sqhk.co/zagakobafot/YUyhhg3/gifajulitoluzob.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/M1Q3fge/rescue_girl_fortnite.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/jsYhdZf/fupamositurixajofexi.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikewe/6UU40ig/77245697117.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/7582317.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/ifYicgd/paypal_login_my_account.pdfIn PDF document text
    • http://myyshooop224.site/8578462783btv6.pdfIn PDF document text
    • http://reduslim-shop.site/btec_sport_revision_worksheetsogt8z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_5fdc1fed1a617.pdfIn PDF document text
    • https://cdn.sqhk.co/ninasodivofi/heb1xGu/zaxagubivototaxonisoju.pdfIn PDF document text
    • https://cdn.sqhk.co/biziduwime/C8QXjic/kudaluguwanidanamokunukug.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/FwxEjcZ/buy_drum_sets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444646/normal_600caa096a6a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461497/normal_600b8fea5f117.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/dgiifgg/faziwovidumejilovexesurez.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/iHieLhf/adderall_xr_time_to_effect.pdfIn PDF document text
    • https://lakupofudeb.weebly.com/uploads/1/3/0/7/130775354/zudufaj.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwikiw/FheDItE/18844038131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421944/normal_5fd2f8d68f97b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 5352 bytes
SHA-256: f0722fb13428ffa665d2dc9e419d28b58a5f68e290eed794c9121bd15ffb63fe
font_01_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 10624 bytes
SHA-256: dc6b7c40f0ac745858ef6f86e018da6ae3e8a8456e72788c93621af90e927bc5
font_02_sfnt_off0001258d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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