Malicious PDF — malware analysis report

Static analysis result for SHA-256 98631a16a333d794…

MALICIOUS

PDF

75.6 KB Created: 2021-06-06 04:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c055428a7f289033fae0577486507324 SHA-1: a9d8798acc876b8f03381135d1c3ee7066e95219 SHA-256: 98631a16a333d7949c75fa2df0bf797faab3bb8071f9e1c684ae7e902272685e
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 0.9989

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://ketchas.ru/pbw?utm_term=star+stable+hack+generator+2020 PDF link annotation
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/e53e54e23d00.pdfIn PDF document text
    • https://dumexegutotopu.weebly.com/uploads/1/3/4/3/134354144/1237055.pdfIn PDF document text
    • https://rujunile.weebly.com/uploads/1/3/2/7/132710621/vijebiduwarakisafu.pdfIn PDF document text
    • https://nozirokopen.weebly.com/uploads/1/3/4/6/134613575/xafadeka.pdfIn PDF document text
    • https://nasuxixogidipan.weebly.com/uploads/1/3/4/7/134701521/wakilegolanowubu.pdfIn PDF document text
    • https://tituwuvosaladu.weebly.com/uploads/1/3/4/8/134849885/kobumoba.pdfIn PDF document text
    • https://zefugomifavo.weebly.com/uploads/1/3/6/0/136087281/xitizuzaxebonor-dekeji.pdfIn PDF document text
    • https://gokidobizivoji.weebly.com/uploads/1/3/4/4/134495246/zurovudo.pdfIn PDF document text
    • https://durunefa.weebly.com/uploads/1/3/4/7/134712847/6417841.pdfIn PDF document text
    • https://bigadamedoje.weebly.com/uploads/1/3/1/3/131384249/lopiluzilirinakafuta.pdfIn PDF document text
    • https://jawejeletisib.weebly.com/uploads/1/3/4/8/134886371/xakelajusad-bulolivexas-ligijixa-dilosijagipod.pdfIn PDF document text
    • https://nazugawexavidi.weebly.com/uploads/1/3/4/6/134678572/95c8a141cf4574a.pdfIn PDF document text
    • https://nirasiban.weebly.com/uploads/1/3/4/3/134344158/vojepevaxobowaxow.pdfIn PDF document text
    • https://ropojagininu.weebly.com/uploads/1/3/4/6/134635708/rakuziwomoker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viluxese.pbworks.com/f/wajigusewotorotupufen.pdfIn PDF document text
    • http://kizisoj.pbworks.com/w/file/fetch/144526257/what_is_the_term_duty_roster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16a3bec8-5b19-4627-9d77-79a30e01dd27/13462694061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6068f106-bd9b-49d5-83dc-ec0c73abbcb0/58445076193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a3cb18-0701-4a79-b203-f4f7fc62f8f3/weduvitanip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a8f10b8-c0c8-494c-a599-41e0a3eb966f/86998657263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd690faf-cf4f-4136-b327-6fe0b5546d75/15950627664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4acc9568-9a7f-42e1-8e70-dc75296d5e77/7904400939.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/f/63506147770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efadd536-084c-4a6b-aef8-0b738d3ef457/kofexaxedadise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe49bb6-3551-46e4-b2f0-55e0b54960a5/49676409518.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_off0000d21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21F 5640 bytes
SHA-256: cbd37548134cc0616667a886f2f2e12aa44c9c1adf66671c873ad7a9d033eaa1
font_01_sfnt_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 11216 bytes
SHA-256: ab25d46316c998a7dcbd7fd0d8ffe92ae434a16e15f6518e3b8d97112b249a4f
font_02_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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