Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bfa9021e879242…

MALICIOUS

PDF

82.1 KB Created: 2021-03-11 05:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2c04a41481382e30ee2a6c587c071797 SHA-1: c668fcf8c60d5998357ce7cb05da228c7fa76e8e SHA-256: f7bfa9021e879242884b01b527a6759aea8af84aa7bc66004418d07ae1f41dfa
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. The embedded URLs point to domains that are part of this link farm, suggesting they are used to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/award?keyword=effects+of+cyberbullying+on+students+academic+performance+pdf PDF link annotation
    • https://walutosewog.weebly.com/uploads/1/3/4/3/134312240/05a034f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446646/normal_5fe151a71d317.pdfIn PDF document text
    • https://xaleratugigajij.weebly.com/uploads/1/3/4/6/134631249/1c24f310103a5cd.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/jeuwOLR/15697408395.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/9090817.pdfIn PDF document text
    • https://tukareteran.weebly.com/uploads/1/3/5/3/135307171/4730721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426261/normal_6030d8ef97801.pdfIn PDF document text
    • https://bunexomuxupekir.weebly.com/uploads/1/3/5/3/135316193/7482518.pdfIn PDF document text
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/naretivefu.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/uhb4zja/injustice_2_mobile_characters_ranked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_600a4ed043d2f.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/jjifPii/77841885739.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/4fac600.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/thaaauA/23420625219.pdfIn PDF document text
    • https://pigumetazemebet.weebly.com/uploads/1/3/0/7/130775485/8895298b1d.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/03db1cac-ca9c-4954-99d3-21ddba45f97b/diff_between_promissory_note_and_bill_of_exchange.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/sivolugegeresejen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42305073-2d46-4e3f-af0c-29b9f8583b48/witaxoku.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/what_does_audacity_mean_in_a_sentence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59879be-80d2-4455-b3ba-816bc964ca34/fatesededitesikaguvija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ac3226-964b-461b-9e7c-ce709b5c9ae6/78916638498.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_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 5676 bytes
SHA-256: 5d00e12c6c1d2e41870519df291e488cf41ecc6b5af77dc24eaf8e1572d40eda
font_01_sfnt_off000115a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A3 11032 bytes
SHA-256: f31888ff13a0c149c86ffe7868c5a97cc99c5cb68c1ad0c16254549ea56201bb