Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cca2323890ad25…

MALICIOUS

PDF

81.9 KB Created: 2021-03-03 08:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fb98c6bce2a16d3009016ab3b3edb1df SHA-1: 2c1fe3aed1bed9d9b59b01c995b6e642771fb992 SHA-256: 35cca2323890ad25f04ddb940b611b745173f059328e6a7dec324e4ee629eb71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://crophysi.ru/123?utm_term=5+paragraph+essay+graphic+organizer+4th+grade+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383156/normal_5fceb4f452cfe.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/tjbTijz/zamumuninasum.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/jhnidNC/all_in_1_social_media_app.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/gmsBlLH/lanud.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/Q0Hrqhf/ratavaxoxalimonuzakiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/d0smAgi/22687015801.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/y3EjgkK/56106494978.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381534/normal_5fca6b82a8e82.pdfIn PDF document text
    • https://cdn.sqhk.co/taxeseta/fhchaii/mujiwaxatikidakiwixo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425737/normal_5ff91ef1167a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tarajix/allegiant_full_movie_in_300mb.pdfIn PDF document text
    • http://vininotubosom.epizy.com/manejo_del_cultivo_de_arveja.pdfIn PDF document text
    • http://jusarim.epizy.com/bluestacks_pc_64_bit.pdfIn PDF document text
    • http://zopatirek.epizy.com/utorrent_free_new_version.pdfIn PDF document text
    • http://ganudanadekapix.rf.gd/jotawutubefopeji.pdfIn PDF document text
    • http://lipisalozolujew.epizy.com/equivalent_fractions_4th_grade_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/gmat_prep_book.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_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 5656 bytes
SHA-256: 186ac33561d2e29e3c1404511c1967b984c8fb41bb45658fd8957deda7e320cf
font_01_sfnt_off0001157a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 10956 bytes
SHA-256: de32bfe5bcc39be50705e80b9eda52061c5b210dbd5fbeb99ad4a4c9986cb59e