Malicious PDF — malware analysis report

Static analysis result for SHA-256 f022ac717795cd8f…

MALICIOUS

PDF

86.3 KB Created: 2021-05-22 10:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6644dec8acc68e2f799fe5a3ebd6dfd1 SHA-1: 3c9528b948fedff71acb3645b2d9fe864a493890 SHA-256: f022ac717795cd8f21a53a4a9be1ee047c61ab5c8784ee1202ece87eed8ad5f9
156 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 0.9985

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 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.
  • 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://fokemale.ru/strik?utm_term=ldc+previous+paper+pdf PDF link annotation
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/pupal.pdfIn PDF document text
    • https://sapuvitajesi.weebly.com/uploads/1/3/0/7/130776539/zexifuvo.pdfIn PDF document text
    • https://ragivigelogupow.weebly.com/uploads/1/3/4/5/134525503/sarapowedefakuxanegu.pdfIn PDF document text
    • https://vivorewipaxuje.weebly.com/uploads/1/3/4/3/134365477/getuw_soruvakomomodi.pdfIn PDF document text
    • https://pamukisap.weebly.com/uploads/1/3/4/7/134761215/6bde683e2768b83.pdfIn PDF document text
    • https://kugibunil.weebly.com/uploads/1/3/1/4/131437599/pebatevej_kirorisokafaz_juleli.pdfIn PDF document text
    • https://rikumuxazomibib.weebly.com/uploads/1/3/6/0/136082685/dofazuzufaralasimevo.pdfIn PDF document text
    • https://nitomono.weebly.com/uploads/1/3/1/4/131454496/tidubumutowotid.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/varajamiv.pdfIn PDF document text
    • https://jupedozezuwobig.weebly.com/uploads/1/3/4/0/134040413/fb84c7.pdfIn PDF document text
    • https://pufemomanuxisi.weebly.com/uploads/1/3/4/3/134344256/6529942.pdfIn PDF document text
    • https://rajiketuwomap.weebly.com/uploads/1/3/5/9/135957261/5100529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/43362497019.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/slope_intercept_form_equation_parallel.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/nokak.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/84685126755.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/kellogg_one_year_mba_employment_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/gufenopora.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/barrel_of_laughs_arcade_game_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/gibebonojodovinibuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/brother_mfc-7340_drum_reset_procedure.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/multiplying_decimals_worksheets_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/3d_anatomy_software_free_for_android.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 4812 bytes
SHA-256: a77be079dd41b94e45b5839caef33f90af518624eae843b0b5855e7a5208a3a0
font_01_sfnt_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 10820 bytes
SHA-256: c7b98dc3b4faa6377ca74a9e27065bbac4b37f2b3cb94e240c2ff79ca1b437d3
font_02_sfnt_off000128b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B7 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
font_03_sfnt_off00013d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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