Malicious PDF — malware analysis report

Static analysis result for SHA-256 debb8058c1c86c11…

MALICIOUS

PDF

97.2 KB Created: 2021-02-09 18:47:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 25b6660c1644f142fdb38325ccb8a692 SHA-1: fb20bbc6c089a825c7fdcd1826ae2da050d2ac24 SHA-256: debb8058c1c86c115f9a9088921ff22cf73322947e9f3e09e981805e5ff7e0f4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/aws?utm_term=alveolar+osteitis+management+guidelines PDF link annotation
    • https://cdn.sqhk.co/feguzuvubut/idgcnSy/48285219069.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/xiwedok_tojid_tubizamuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_6009bc42c9868.pdfIn PDF document text
    • https://cdn.sqhk.co/diwelamu/bXWjaS7/51537907825.pdfIn PDF document text
    • http://zatuzosej.iblogger.org/nefubonojoxabixijupezux.pdfIn PDF document text
    • https://nusevusigafub.weebly.com/uploads/1/3/1/3/131398220/cda9316e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_601d40ae7287b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476780/normal_5fd269cfa6126.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/950216.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/hghc17R/8_ball_pool_ios_hack_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476436/normal_5ff770bbdff27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5fc63d8f53084.pdfIn PDF document text
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/9784248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_5fffa8fa4420d.pdfIn PDF document text
    • https://cdn.sqhk.co/fusunusol/hijwjeF/auto_reply_to_chat_messages_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_600c1343347d3.pdfIn PDF document text
    • https://jutamuxenaritul.weebly.com/uploads/1/3/1/4/131452982/vosiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415768/normal_5ff49dc691bf7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gudukamu.rf.gd/32916977659.pdfIn PDF document text
    • http://romevakamijoke.epizy.com/examples_of_solubility_answers.pdfIn PDF document text
    • http://virirunabeso.rf.gd/engel_termodinamica.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 5196 bytes
SHA-256: 328b2fa5d555125a683588aee07ca87774484eb668d14f44bfeb1b0ac24bfb53
font_01_sfnt_off0001335b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335B 12096 bytes
SHA-256: 6c573f02dc04fe69a49005ea98ba51a3732ef8acb35da51e2c3454db2d03ca76
font_02_sfnt_off00015aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA6 18328 bytes
SHA-256: d479d5bd8411eae5215d7f50709ba2471a19776f6dff5a02f5e3d36c24baab7d

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