Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65d96c7733ec8ec…

MALICIOUS

PDF

84.8 KB Created: 2021-03-05 10:49:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: da4cb5bd84838730ba75b27c04fcce2c SHA-1: ef6c5eb93e993ef3a3f751ab17c13210f43ce038 SHA-256: d65d96c7733ec8ecc79f9df4e89e1259f5085680a4a8aaaeda6ca45a195d827b
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, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/award?keyword=can+you+build+lean+muscle+with+bodyweight+exercises PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392660/normal_600caa3456b05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_600fd57b14798.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/33afd5f817577f.pdfIn PDF document text
    • https://fijogukovope.weebly.com/uploads/1/3/1/3/131379832/vopati_zawevokitupe_xanegogifuj_tefab.pdfIn PDF document text
    • https://jikumudepopojet.weebly.com/uploads/1/3/1/4/131453433/2540199.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420602/normal_600705a1eb47f.pdfIn PDF document text
    • https://dudenaluwesugo.weebly.com/uploads/1/3/1/4/131453650/sanarez.pdfIn PDF document text
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/barosataderekiv-poxuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_603e48b6396c5.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/7488b0242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_600ad65663d48.pdfIn PDF document text
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/1025dc.pdfIn PDF document text
    • http://konalofasu.mywebcommunity.org/85850918593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486353/normal_6022dfbf680d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_601ab7fb3ead9.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/dalawodejizotexat.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/omnitech_shredder_will_not_turn_on.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wovugi/2017_lexus_es_350_interior_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/furaka.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/battlestar_galactica_1978_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/28097144899.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/happy_birthday_stevie_wonder_piano_sheet_music.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_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 5660 bytes
SHA-256: 292493fa5302cd1b0ac168be10d2eea899ce3e2a8fc773e2168c16561864f0a8
font_01_sfnt_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 10424 bytes
SHA-256: 161602fe575eec0f1bdd17936299ea73b5bf7017077c4fe6cecee9b9b873f4f5
font_02_sfnt_off00013740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13740 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e