Malicious PDF — malware analysis report

Static analysis result for SHA-256 74213c61a44c59e2…

MALICIOUS

PDF

85.4 KB Created: 2021-04-01 23:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ec6920c51c42045675ebcc3ce3b142e4 SHA-1: 10897a0ef7e108cb50deb7370d367f6fd39fb57b SHA-256: 74213c61a44c59e21abbdf19cab9faa5dc1fa4f956ca588390a67c7cdbf87d8b
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 0.9992

Heuristics 6

  • 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 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://crophysi.ru/strik?utm_term=proform+performance+400i+treadmill+%2528pftl59518%2529 PDF link annotation
    • https://sunerewej.weebly.com/uploads/1/3/4/7/134724547/buvozadason-dibedog.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/fIteiv1/resipusadezezaludoluwef.pdfIn PDF document text
    • https://vuzeruferule.weebly.com/uploads/1/3/4/5/134591890/dowoledofofofidug.pdfIn PDF document text
    • http://natosabi.mygamesonline.org/67115494049.pdfIn PDF document text
    • https://cdn.sqhk.co/kezomerameki/jfTjaw5/hoops._io_lucky_toss_ring_io_games.pdfIn PDF document text
    • https://cdn.sqhk.co/pulizojiwim/hjhc1ib/hide_and_seek_imogen_heap_remix.pdfIn PDF document text
    • https://redulexaxoxega.weebly.com/uploads/1/3/0/8/130874010/gazeneka_jagavumigabemew_nanonokamagof.pdfIn PDF document text
    • https://xeraxoxatetubus.weebly.com/uploads/1/3/5/9/135993523/kerivoruniraf.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/how_to_do_media_and_cultural_studies.pdfIn PDF document text
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/4586544.pdfIn PDF document text
    • https://cdn.sqhk.co/xukigipeduve/iflRAq5/26342518007.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/LGLigwa/94025654761.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/firudegix/simpson_pressure_washer_pump_manifold.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_e38ee0901b63402f8074b8366193457c.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_bf7404114e37427b96d4c5f579a9b84a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/tabla_de_verbos_en_ingles_irregulares_y_regulares.pdfIn PDF document text
    • http://zukomakiduw.myartsonline.com/tamil_authors_and_their_books_list.pdfIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_d7bbdaa0a7a74a42b2e9f73aaf62ba82.pdf?index=trueIn PDF document text
    • http://jimarol.myartsonline.com/ray_tracing_algorithm_in_computer_graphics.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_15874b075b5549d7bc03348d6fe9f3e3.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_19191342f7734b9eb1120ba84b38c8b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debiwelof/guxewexixekulumuti.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/63700162621.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_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 6036 bytes
SHA-256: 4aabbedf070ad1f8ff0f8a91ecb1c1c9b8efb59bbc42d3a5e964ecc1f0d20fc7
font_01_sfnt_off00011f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 11796 bytes
SHA-256: 379d1af74baee14e8b09b243b328a77a7a4f59a3a97e760efefd26e237f03fc5