Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed80a4b541adea4a…

MALICIOUS

PDF

75.7 KB Created: 2021-03-13 15:29:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 72425d72aaf029f093f7bde17718fe94 SHA-1: 96d8f23c47b5631490c0c1ad598cc264b469e004 SHA-256: ed80a4b541adea4ac87644cce25dd5392be956b7c42b0d906f726b8b3153fd31
156 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 0.9999

Heuristics 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=how+to+cheat+on+gre+at+home PDF link annotation
    • https://cdn.sqhk.co/wudawagirus/Diqihhe/pegobodowoziwofovokatapi.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/aHhbTha/chikungunya_disease_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/bpPPicb/36758762392.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/d967d3ae-edc1-4b9f-903a-c23073e54ba7/96872042031.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_b782b053074147a1aa89521c4d3a755d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/81703137794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db899dc6-bb57-4239-8012-91272a61e786/what_are_text_structures_in_reading.pdfIn PDF document text
    • http://fuzaxovojige.epizy.com/cardboard_sheets_nz.pdfIn PDF document text
    • http://mavusovemoritev.rf.gd/jikalarodikados.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/all_adjectives_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6cc9463-5211-4de3-be89-1aa6b639198b/what_is_distributed_operating_systems.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/keziwuzug.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/zunarero.pdfIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_be80090dfa4a46a0b14cdd42d8d0a2aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xupimaral/75844368833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1174941-5087-4247-a28e-1aafabda1ffe/24590814716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf5390f-9174-4f4a-9406-5418a78388c8/gikarixifex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c392ac3-4b95-457e-847c-517b1fd6df2a/how_to_set_up_roku_xd.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_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 5056 bytes
SHA-256: 8fb61f8f8853fb0a97e2ae6388ed4aef75361fb1b1b53558c236d4fa601c4751
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 10916 bytes
SHA-256: aad5d48670cd411fd0d8ecf17fb3fb3bdb57c63e6c182da89409c3a0f146d42a

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