Malicious PDF — malware analysis report

Static analysis result for SHA-256 3911e25cb98d24f1…

MALICIOUS

PDF

72.4 KB Created: 2021-03-20 08:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 45f04d827c33dcefd4a0aedd80f08daf SHA-1: b2147039fad57481eb80f31db2501a23f2443729 SHA-256: 3911e25cb98d24f13b6d81e45c11b67e6c67bdd91da6516333840afaba335666
186 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 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://leonvi.ru/wix?keyword=llws+championship+2019+tv+schedule PDF link annotation
    • https://cdn.sqhk.co/dupabeket/dxhcYhe/momakafawulawoxefumowabu.pdfIn PDF document text
    • http://luwinilulurop.mywebcommunity.org/46484357427.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/jLghkpj/fancy_widgets_3._5._5_unlocker_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kebokeregim/gijbVAO/84299168234.pdfIn PDF document text
    • https://cdn.sqhk.co/wanazofemuvu/XdihSpu/android_9_versus_8.pdfIn PDF document text
    • https://nonejazusedebe.weebly.com/uploads/1/3/6/0/136099570/e453152acea.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/6583275.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/roku_error_code_003_comcast.pdfIn PDF document text
    • https://tekevifumufov.weebly.com/uploads/1/3/0/7/130739519/pesudixe-gavejo-junopile.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab3736c3-4db4-47d4-b150-cddb4e9ecac5/vuvobitajukolowejazitixu.pdfIn PDF document text
    • https://c6b89c2f-dc7d-490d-a648-077c51828da9.filesusr.com/ugd/29ab01_a60f5e53045648dd94ec2e15790423b6.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_f59300edaeec4eeca345bef0d65572f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62093799-fe4d-44f3-8a8d-ade4e8b9172f/what_should_i_do_if_my_service_engine_soon_light_comes_on.pdfIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_a424d26f4be14afc85c9a116e24386f3.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_19028f7ea801460eab03aabda3950f1b.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_ac322d74a363423b939ec495e723761c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0628691-489e-4693-a71a-c717738659a1/war_of_the_worlds_2005_4k_review.pdfIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_9d316e6a657a464ca3f7d184316b18fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/446d9d96-15c7-4445-b66f-4190ac79b8b7/99471200330.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_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 5792 bytes
SHA-256: 3f7745c3da38fdade11a09c1faf57932c3434b74ab1395029048242a70f27cb7
font_01_sfnt_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 10944 bytes
SHA-256: 498b62662bccb983300b673b22e8c207cb1771ba0ced83b7a925e34a5e098575

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