Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb33322322a8469d…

MALICIOUS

PDF

76.9 KB Created: 2021-02-22 20:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8ea9b9e4f7f670f4e97b137aa779f250 SHA-1: 3eee73cb4d54fa9850f38a852a14b82501820df3 SHA-256: cb33322322a8469db1c9782de2605cd1f1b31a7c8b3d06eaeac9701c492d668f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users through a malicious attachment to a site that then redirects them.

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://jacksth.ru/123?utm_term=d%2526d+player%2527s+handbook+5e+pdf+full PDF link annotation
    • https://rugexivik.weebly.com/uploads/1/3/1/0/131070765/sisumuz-vukukid-zefepuketatamut-bogubududosibov.pdfIn PDF document text
    • https://lonexababite.weebly.com/uploads/1/3/1/1/131163854/jisijevil-fizivikir.pdfIn PDF document text
    • https://bivorafonesakal.weebly.com/uploads/1/3/6/0/136021739/vokufetukujixefato.pdfIn PDF document text
    • https://mubonunegaj.weebly.com/uploads/1/3/0/8/130874179/b4a9216d5b6f76a.pdfIn PDF document text
    • http://dasaburaxad.22web.org/finding_oblique_asymptotes_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/gVUhaEg/36447367996.pdfIn PDF document text
    • https://mopirolelawa.weebly.com/uploads/1/3/4/0/134012876/6960121.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/ghXiaic/cops_and_robbers_minecraft_map_1._15._2.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/6gijaJc/randall_road_animal_hospital_crystal_lake_reviews.pdfIn PDF document text
    • https://wuzesitawe.weebly.com/uploads/1/3/4/7/134733123/xexup-febab.pdfIn PDF document text
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/62ba09c.pdfIn PDF document text
    • https://kolabonedabisam.weebly.com/uploads/1/3/4/3/134398983/1052056.pdfIn PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/J8EjhfN/greenleaf_season_5_cast.pdfIn PDF document text
    • https://zoguripan.weebly.com/uploads/1/3/1/0/131070442/e495c1912dc232.pdfIn PDF document text
    • https://toziraza.weebly.com/uploads/1/3/4/5/134506396/9687611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://matasup.rf.gd/54363236741.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/33797139193.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/misozupa.pdfIn PDF document text
    • http://kavolimuteso.epizy.com/physics_vectors_worksheet_with_answers.pdfIn PDF document text
    • http://figavexujofivu.rf.gd/viwogunil.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD428 2960 bytes
SHA-256: d8ef148c594adba1946aa7d95f188f3f33f69c77bc22762a1a4a57bcfd89a796
font_01_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 4156 bytes
SHA-256: 5ae3bcc49c87f96444fbe3d11ff27db43b6aea299416b9f3d286273c64098da8
font_02_sfnt_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 10500 bytes
SHA-256: febec0dec18ce122ef9dfa1dcf239c6675987678f140898b1cf8f3b523af55d8
font_03_sfnt_off0001110e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15