Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a5371b6a59e901…

MALICIOUS

PDF

126.0 KB Created: 2021-06-04 08:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: daa6abb93e048a259dc16d83e8ff5ea8 SHA-1: de35c5faaa86cd4cb3d1c8650c7f9b7a7fda9d99 SHA-256: a1a5371b6a59e9015f44deeccc961c5c4d3d8f7b547ea5c852ea6d9b2b18abb1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9999

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://coretry.ru/pbw?utm_term=mhi+05+history+of+indian+economy PDF link annotation
    • https://naloripuzugusow.weebly.com/uploads/1/3/4/8/134850631/dalowufudafesu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419235/normal_600887d5b0bbb.pdfIn PDF document text
    • https://luxaxila.weebly.com/uploads/1/3/0/8/130814132/motek.pdfIn PDF document text
    • https://vodunifowabot.weebly.com/uploads/1/3/5/9/135992931/3441be5f14.pdfIn PDF document text
    • https://kotazadan.weebly.com/uploads/1/3/4/3/134349323/2740633.pdfIn PDF document text
    • https://piladokad.weebly.com/uploads/1/3/4/7/134759874/f3a4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420747/normal_60239df6c992f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruxafonan.pbworks.com/f/xaxutizafavevuw.pdfIn PDF document text
    • http://funesut.pbworks.com/w/file/fetch/144558909/86478474986.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/bengali_movie_bondhu_full_movie.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/f/explain_the_examples_of_direct_and_indirect_expenses.pdfIn PDF document text
    • http://silasofinat.pbworks.com/w/file/fetch/144443865/difference_between_amorphous_and_semi_crystalline_polymer.pdfIn PDF document text
    • http://podixarutib.pbworks.com/f/cheats_for_gta_san_andreas_android_apk.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/watch_bts_bon_voyage_season_2_ep_1_eng_sub.pdfIn PDF document text
    • http://nosegawibaso.pbworks.com/w/file/fetch/144517461/five_nights_at_freddys_the_twisted_ones_graphic_novel_release_date.pdfIn PDF document text
    • http://pebenuziwi.pbworks.com/f/hannah_arendt_livro_a_condio_humana.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/f/17060532950.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_off0001aec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEC9 5600 bytes
SHA-256: 10f59a2687a538384c268a9c0178784fbd595db6c642d263e869e37dbc752db2
font_01_sfnt_off0001c1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1C6 11836 bytes
SHA-256: 3ffb972768e46ac2a147e6c6e460ec140446103042012b36ee29e62853833e97

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