Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4499550814acbd5…

MALICIOUS

PDF

84.1 KB Created: 2021-03-07 19:00:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 26c20e849dc3fe1e8c79c6a68252a867 SHA-1: 49ec875f4843684d322ae6e6bc7baaab80a87908 SHA-256: e4499550814acbd5fccd150de7655ccc77872a886e19f3e45d58c0f011a35eba
186 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 ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary purpose appears to be directing users to potentially malicious content hosted elsewhere, rather than containing a direct exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://xajibur.ru/strik?utm_term=ray+bradbury+the+pedestrian+text PDF link annotation
    • https://xogosafaxisomig.weebly.com/uploads/1/3/0/7/130739024/juwituma.pdfIn PDF document text
    • https://cdn.sqhk.co/zukuxenopo/um5Qhgt/kizebepufexexusibu.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/ij3Ggd1/napide.pdfIn PDF document text
    • http://creditscorehelp.info/dirt_farmer_all_quest_guideqpfcw.pdfIn PDF document text
    • http://funofuzifige.iblogger.org/mozilla_firefox_version_50_to_61.pdfIn PDF document text
    • http://aycotoro6.xyz/ludo_controller_pro_apk6y4ch.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/8419446.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://fojamemu.epizy.com/69056632543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f13fbdf-713d-405f-8908-2b7138f7f3e6/i_am_a_child_of_god_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f4485c-86e0-4b8b-8fba-9d07fb72e083/us_civil_war_short_summary.pdfIn PDF document text
    • http://lavovexerok.epizy.com/56545049664.pdfIn PDF document text
    • http://sekovukubetib.epizy.com/3_column_chart_word_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/89452921062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74a1ee1-4c0f-42df-8a6c-1203bd72aa65/how_to_describe_tree_at_night_mask_body_shop.pdfIn PDF document text
    • http://lexanowojuraja.epizy.com/97043286336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c36468-8092-40bf-886e-424302ddd039/dijepada.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/nuvorujal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/451940a9-9c16-43ee-aa25-328792583358/como_hacer_una_foto_digital_tamao_credencial.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 5104 bytes
SHA-256: b174e52790f96f04e15d42ce24ff219e99e38835f0a5ea14a85b61a3b2b830c2
font_01_sfnt_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 11392 bytes
SHA-256: 18c807e1cf4320fecd4e8a9eede6a9e387acc9ed77e4f3f10b899d967e79e14a
font_02_sfnt_off0001350c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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