Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1aeba2aa9f06d45…

MALICIOUS

PDF

83.4 KB Created: 2021-03-09 01:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 573b661e22bb67da5a945b486c244a33 SHA-1: 620c85c17fe88592dd59bfdb8d0890c16b6623fb SHA-256: b1aeba2aa9f06d45b3c6528c60a00b1c6977c853a1d0662c9eeb85ca27b79daa
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 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=confidence+treadmill+parts PDF link annotation
    • http://hot-money.fun/palidemoxunexeda2ovsz.pdfIn PDF document text
    • http://life-news.tech/kurobatipak92mxk.pdfIn PDF document text
    • http://zootime.store/vokubijugatowomowubegazoegnxn.pdfIn PDF document text
    • http://doruguduku.iblogger.org/dragon_quest_builders_2_guide_ign.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392191/normal_60221afe477e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421641/normal_5fcc9f0c4a8b7.pdfIn PDF document text
    • http://trend-sales.fun/98921864974xdldv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496585/normal_5fe8e544abf15.pdfIn PDF document text
    • http://my-favshoph.online/61697179504d6jqh.pdfIn PDF document text
    • http://gubimulugepu.22web.org/chamberlain_universal_wireless_keypad_instructions.pdfIn PDF document text
    • http://rowozogano.22web.org/biological_molecules_proteins.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_47b9bddb5ed641d786f781b17acdd59c.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_7995a8f65226438dbc4cdefa63fa1940.pdf?index=trueIn PDF document text
    • http://dativolulonal.epizy.com/zanujatuka.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/school_bullying_complaint_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/73858485354.pdfIn PDF document text
    • http://mokudomares.epizy.com/midsummer_nights_dream_sparknotes_act_5_scene_1.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_54c96d9a0c9e435a8140eb8520ef797c.pdf?index=trueIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_c640231f439740078204a09c63d00946.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasutiz/benede.pdfIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_070540b6465d4e85be136d1e4a5d09d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/12726895142.pdfIn PDF document text
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_95121825435f4d528b80449295c573eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kotenu/premier_protein_shakes_walmart.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_e2bf220a8fc24997831e2458da57a38e.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_4a1445c17f58408690ae9a053054452c.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_2874242b08194a139ea28e2fd1618c3e.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_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 5208 bytes
SHA-256: 4d1465d129e0c3bcd0c3deab294dbf3528973b6e472f7f6bba49853450251efa
font_01_sfnt_off00011976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 11368 bytes
SHA-256: 4a975d7da5f967b7a73a53fb8778879e968a0d85a89b618781ac28b66c54a753