Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e32d27358a87f2…

MALICIOUS

PDF

83.7 KB Created: 2021-03-18 17:16:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1f85ae47b6cb336c4261b6d658b1832f SHA-1: 2eda5173f87a7eccb072120345ba268a27ebf2d9 SHA-256: c9e32d27358a87f2a15cd7f6c6cccbf2be2ab9cfe43d7cbb1cbd345620a8732b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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

  • 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://nipisod.ru/123?utm_term=clicker+heroes+outsiders+guide+2018 PDF link annotation
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/888800fa.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/passive_voice_mixed_tenses_exercises_with_answers.pdfIn PDF document text
    • https://kopaluzakiletal.weebly.com/uploads/1/3/0/7/130739322/binegoje_sonetetonetoduw.pdfIn PDF document text
    • https://kegewibenufugix.weebly.com/uploads/1/3/2/6/132682471/barafukirut_bopalenudub.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/kosipefojaw/barnett_rogue_crossbow_4x32_scope_package.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f768d22f-f407-4a91-8c6f-c64eb80b059b/free_willy_streaming_italiano.pdfIn PDF document text
    • http://zilamefuwata.rf.gd/metarhizium_anisopliae_biocontrol.pdfIn PDF document text
    • https://eb7ae0bc-69c2-4833-8adb-ed465737bb77.filesusr.com/ugd/23493e_af598f1db9604c5bae8389ace2e29eb4.pdf?index=trueIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_3f67fa258e854d1b93c52b9108e2918d.pdf?index=trueIn PDF document text
    • http://jilevatawew.epizy.com/mezevumovuxamazuviku.pdfIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_2552ed9425a74e5894bbc0c688d32448.pdf?index=trueIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_9f8993205ba94c5cb4153d02c72514a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea79230-6ea5-41d5-9423-11e9514be43b/jefalubulegatapasapoku.pdfIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_9deb8da475604fb587fbaf16e5ef9dba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevelel/12157068244.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/how_to_eat_fried_worms_full_movie_fmovies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42830a0c-63c4-4e48-a8ec-e4bec830b91a/tobotuniguvogowesiwedixo.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/10408030607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a63272-d42b-4a6f-bcbe-c8efa2c08ae4/94634902290.pdfIn PDF document text
    • https://redd.it/7on5itIn 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_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 5480 bytes
SHA-256: d679fe6d089808c65055eab5566b2b3f278c7097d63cabcbdfc011d83e5e4ee9
font_01_sfnt_off00011a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 11628 bytes
SHA-256: 1ee99616f4db6308ef79ecc93446a2ed6b7e2900ba5583572d46cd7e64707ab1

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