Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8acc046593c5a3e…

MALICIOUS

PDF

85.4 KB Created: 2021-03-02 13:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f34130436a12b5fc2d3fae4f8f7e35f8 SHA-1: c24b59c0a715b286d9e73a28f8083f12e3761b4d SHA-256: c8acc046593c5a3e66446714a70da4ebe2ccbd1d79cc8577b67e4f8f4f9a9aae
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of external URIs and the link farm heuristic strongly suggest an attempt to lead users to harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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/wix?keyword=spiritpact+manga+chapter+136 PDF link annotation
    • http://podarokinsta24.online/darwin_and_the_beagle_alan_moorehead5fgf4.pdfIn PDF document text
    • http://kprovk.xyz/how_to_pair_with_ue_megaboomffvui.pdfIn PDF document text
    • http://rowaxuxot.22web.org/75145857641.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/the_universal_traveler5gb99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_6013c78b8088b.pdfIn PDF document text
    • http://fartook.online/884629128328pt04.pdfIn PDF document text
    • http://bathforlegs.xyz/51601957090fyc3t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465127/normal_5fcf43f3204a6.pdfIn PDF document text
    • http://guketaz.iblogger.org/what_is_the_newest_trials_of_apollo_book.pdfIn PDF document text
    • http://starkrobotics.org/how_to_set_a_casio_wave_ceptor_watch_51612cmxy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485578/normal_60192f6ab4892.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428331/normal_5ff864f718628.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488837/normal_5feb16763006f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/kumasala/halving_worksheets_for_year_1.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/how_much_do_boeing_engineers_make.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/meritorious_award_certificate_format.pdfIn PDF document text
    • http://buvetixebofexe.epizy.com/viduwokorife.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/customer_centric_strategy_template.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32F 6424 bytes
SHA-256: 1bea1bf6bb495c86e5c0c202298e7aff2b43227f67504ec7a360cac58a71b6bc
font_01_sfnt_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 2960 bytes
SHA-256: 63b4f3ac6df964717e0f939d5e374baa1087f85db4e1708eb96a63890baf8331
font_02_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 5612 bytes
SHA-256: 7762f0118f8656a2f2340c4f6403f91ce82155466a3ba60ee3f4daddcaed380f
font_03_sfnt_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 11224 bytes
SHA-256: f9650c14429b7916dc6a5679786cabbcf9ee12b847992449b1682b7c1f956274
font_04_sfnt_off0001258e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258E 16280 bytes
SHA-256: a58881b8e8c07df208ade4d78838e73b890a03d003d1389aa2a35cfd322ef469
font_05_sfnt_off00013b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B56 2780 bytes
SHA-256: 74a2db10e1b7189e028aee1c8e2aa0d63b398f5be1f1e7a5118a254f503925d8