Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b00f5ba61826150…

MALICIOUS

PDF

127.4 KB Created: 2021-03-27 15:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a556e38a47f31641aef8fd7d3f37c65e SHA-1: 54d55af63a6229541a7edad749bb51e1dfe53773 SHA-256: 3b00f5ba61826150e5444fddf7a2597fd2d1fa585ab80ce2ffb4752c8ec41577
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 0.9962

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://jottigo.ru/award?keyword=arm+cortex+processor+pdf PDF link annotation
    • https://tozilamuvopodes.weebly.com/uploads/1/3/5/9/135966944/3096819.pdfIn PDF document text
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/7041217.pdfIn PDF document text
    • https://zowobisa.weebly.com/uploads/1/3/5/3/135313501/zegejolupireku.pdfIn PDF document text
    • https://fuzefiwojagolo.weebly.com/uploads/1/3/5/3/135308179/1757485.pdfIn PDF document text
    • https://wadabugijiri.weebly.com/uploads/1/3/0/8/130873870/ba79e7f73b5e.pdfIn PDF document text
    • https://dofopukirisozut.weebly.com/uploads/1/3/1/4/131437491/latov.pdfIn PDF document text
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/79a432debc22.pdfIn PDF document text
    • https://vusuranozaxo.weebly.com/uploads/1/3/4/0/134012668/gagobonizitezuzavura.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_9b46ea7b19bb40ff910a061d309de673.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_d151745533fc4d3dba98c755cab7f18f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/what_are_some_fun_facts_about_brown_bears.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d5b50e3-d383-41f8-8175-4e4aa0e0ed1a/rotedif.pdfIn PDF document text
    • https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_273ab48affde490da7ebf778affb13de.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_8b84da22af464503a1f9f8bcf613a928.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijudow/lose_yourself_instrumental.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/21725810203.pdfIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_b7e1c310ebb848eaaf933e8d727f19f3.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_ffecb3981766453eaec53de4ef3715be.pdf?index=trueIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_9a20e0862d0749dcad41c77d5d05320c.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_54ccfcfad88f4d40a274b8a4955bc320.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/53145060378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27fe253-b530-45d3-90fa-f22899768a15/bumetusafibeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/328798ff-6555-473c-ac01-6a685c719c66/does_verizon_have_lg_phones.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/xizudepizimakamarirabo.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_e9dd428fe04041658e1ae373847e3bed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be554a64-6f64-428e-93e0-9a9eab67a43b/29466609671.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_off000192ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192AB 10868 bytes
SHA-256: 243e2f88bf7f8da317e174603ed94555f269b990ab316bf60a5245f754fd28f0
font_01_sfnt_off0001b564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B564 5116 bytes
SHA-256: 8a2f725c8132c01e65103717fe6e9d35d63c86bf61e4206f3fa534784bf553a3
font_02_sfnt_off0001c6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6C2 12336 bytes
SHA-256: 854931930c925c7870296fe977a942188eb07ff22547f790604d9ae0b00eb3da