Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef29d0c4dbbb268c…

MALICIOUS

PDF

81.7 KB Created: 2021-03-27 18:37:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c44e2b58110063d9a1ee435272cecb93 SHA-1: ad000318c78511b5e73653547acda4c32491fb90 SHA-256: ef29d0c4dbbb268c61dc170af6d468beca5012d0b072e065d5033124cc339032
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 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://soxebez.ru/wix?keyword=yesterday+pdf+google+docs PDF link annotation
    • http://bestunew.xyz/places_that_sharpen_chainsaw_blades_near_meodsio.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/dukaramegeguse.pdfIn PDF document text
    • https://vugilove.weebly.com/uploads/1/3/4/2/134234765/9498094.pdfIn PDF document text
    • http://polfact.site/rewopexedeka2s37b.pdfIn PDF document text
    • http://tehnotop.site/dj_mix_pads_2_remix_versionr8cvh.pdfIn PDF document text
    • http://snt-br.ru/1998891649609809.pdfIn PDF document text
    • http://naturalm.space/92927631681ov4zk.pdfIn PDF document text
    • https://judenebubiz.weebly.com/uploads/1/3/4/6/134656374/64952.pdfIn PDF document text
    • https://dinumaditu.weebly.com/uploads/1/3/4/4/134479473/fumarojagelapu.pdfIn PDF document text
    • https://dirarogevuku.weebly.com/uploads/1/3/5/3/135351224/9699996.pdfIn PDF document text
    • http://oneitshop.pro/78954322616cjxwg.pdfIn PDF document text
    • http://hh666o.site/how_to_charge_a_fitpro_smart_braceletlztb9.pdfIn PDF document text
    • http://kilobowomix.22web.org/zebilinozup.pdfIn PDF document text
    • https://wobanuwu.weebly.com/uploads/1/3/5/9/135959505/xugezapar-dutuzotozo.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/jokotaziweluge/what_do_parallel_lines_on_a_x_t_graph_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/livros_google_books_online.pdfIn PDF document text
    • http://rumajajoneder.rf.gd/flannelette_cot_bed_sheets.pdfIn PDF document text
    • http://sozanorokov.epizy.com/printable_keto_recipes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 5388 bytes
SHA-256: 0a8f31f6613278abe2f1eccfff305fdbff01007e6c3741642709fb5f8f3eec97
font_01_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 11192 bytes
SHA-256: 6c67c1d958ae2e01213c1937ac7ed274b6351da106300b36a3ef1759d9fd7501
font_02_sfnt_off000123d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 16388 bytes
SHA-256: 0c82561ead172ac0e51412abe629b5944d5f81f469066018c017fef234fe4ba7

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