Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae018273bfcad6d5…

MALICIOUS

PDF

75.5 KB Created: 2021-03-17 03:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0f420f5dc743d6d563c5907c8ed48222 SHA-1: bdc763b394236a4a1089969e9f43ae0cd1e95669 SHA-256: ae018273bfcad6d5c2d1916d591b1038ea7a308accbb8236633aca118e4bded0
186 Risk Score

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 0.9997

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://seumenha.ru/wix?keyword=roblox+%252Fe+sit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468819/normal_5fc858b9ae924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473053/normal_5fd26cf444a34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5fe662a3bce7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490953/normal_601e878aee015.pdfIn PDF document text
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/3a57b166.pdfIn PDF document text
    • https://waniritapi.weebly.com/uploads/1/3/0/7/130739375/842a302c9fba94.pdfIn PDF document text
    • http://tanijosek.22web.org/28718525864.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_89f38d63913344f5a75808556f5bd10b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce45fc9-e91a-4a4e-aab4-51b4476cc012/la_la_land_guitar_tab_bryce_vine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b910ebe1-accd-4f55-a2ba-58ef19aa4c41/bob_evans_6_cheese_mac_and_cheese_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6703843e-8e98-4828-afa4-ed8027e9fed7/absolute_value_functions_worksheet_answers.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_fc1bd15dbe1e492ea945f8b385781019.pdf?index=trueIn PDF document text
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_92d5c4311f9e49679f3d1a95527c688f.pdf?index=trueIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_5bef9f85c144468a80aca0900133d176.pdf?index=trueIn PDF document text
    • http://puwomuf.rf.gd/79483786184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282add0c-8740-498d-bf9a-32e13ee56c27/what_is_a_three_circle_diagram.pdfIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_b380eca7949049eeaefac4d4ec3058fb.pdf?index=trueIn PDF document text
    • http://valodabopovox.rf.gd/44604369891.pdfIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_2b96a13b826c4d4f80fb81a4f6c0291b.pdf?index=trueIn PDF document text
    • http://widafasamuj.epizy.com/fill_in_the_gaps_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8946d58a-0265-4842-b08d-0a63123aa2bf/mameberabapamikajoxal.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_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 4624 bytes
SHA-256: 3ce7fd123a378d8ddcc4dab3dc7ef4de911c22d1142e570de9c4b1f5f1986f05
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 11464 bytes
SHA-256: 717997b4b49b6dda0025b8138f487ecbc1921c3193e8530cb947141ecb5838d7