Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd0f787e9447395…

MALICIOUS

PDF

77.1 KB Created: 2021-03-17 07:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9450bf0b965736583838621bcbe3832b SHA-1: 7303cd77ce02067ffb6713689343e986ed21b401 SHA-256: efd0f787e9447395219213d3270227db86f08ed0ba0b031283f5f98a73a31f90
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 0.9995

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://xezojetit.ru/123?utm_term=catering+business+plan+sample+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469103/normal_603c51ff9f165.pdfIn PDF document text
    • http://oneitstore.pro/ccsp_bookvowkk.pdfIn PDF document text
    • http://mantenancie.com/sims_3_mac_2020mgkhd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455179/normal_6013350b95420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_5fe76d3e759af.pdfIn PDF document text
    • http://doctora.club/best_bhakti_song_website1ns0q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481173/normal_5fcdacb242582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485799/normal_600c8d8285028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464870/normal_604f75112cbb6.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/lazesej/sofagivifuxetaxew.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_2e2db818e9394d85a01aacd84cd99994.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/179c1ce2-5238-4c19-b8c1-291b1b687cb3/what_are_sentence_starters_ks2.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_4f3234a76fb0469eb99ee283a1973a90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03255dd2-f63f-405a-ada9-19e922b2d015/marshall_jtm1_50th_anniversary.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/on_the_right_track_pippin_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3165d7b5-555c-4883-a420-9d0274dc7033/how_to_find_textual_evidence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3809f3-987e-409a-8c69-2b457dd8abd6/47354346294.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/25951725931.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/gatibutowutelufavuroriwo.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_e699e80133cc424bb101d73393ebfa1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cdec431-b1aa-402f-b03c-a7be08776da1/97752774901.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_a562706d72ea45b4bbdfbbd41fb7ead2.pdf?index=trueIn 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_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 5404 bytes
SHA-256: db815d29720e571c0ec2fd831533523989d4b45edc5d47332c06ecb3825e39f6
font_01_sfnt_off00010299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 10516 bytes
SHA-256: 581442a4dce835d8788f1cfb9c25b6a89abac8d9bd211338cee672b210fa6716