Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09e97948c3553b7…

MALICIOUS

PDF

87.0 KB Created: 2021-03-24 05:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8ec8dd4da1ae189ed3425649caadbb2f SHA-1: b3eb6ffa1aa6a5ee052e5b593ff726f65e785e96 SHA-256: f09e97948c3553b7541d499e364138a257cedbcfe69a52e0ccd25364f4dc45a0
126 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or link-farming operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrustworthy hosting, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://gimoguvi.ru/123?utm_term=sqlite+editor+apkmirror PDF link annotation
    • http://siwupezomejen.getenjoyment.net/beats_studio_3_wireless_blinking_white_light.pdfIn PDF document text
    • http://jedugefipevama.iblogger.org/phone_caller_location_tracker_app_for_android.pdfIn PDF document text
    • http://zujazufomok.iblogger.org/22705561920.pdfIn PDF document text
    • http://moreprodukti.com/15792521116is20h.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/kutumesifakisuviwefani.pdfIn PDF document text
    • http://folivapizi.66ghz.com/irrawaddy_dolphin_information.pdfIn PDF document text
    • http://jidogirikar.mygamesonline.org/xusuximikufiji.pdfIn PDF document text
    • http://heliusdesign.ru/sugaworowivopu6k2ph.pdfIn PDF document text
    • https://taxikifa.weebly.com/uploads/1/3/4/4/134496463/zaluwiwileb.pdfIn PDF document text
    • https://setuwome.weebly.com/uploads/1/3/0/8/130874340/vubota_sezilowizug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_3b50b3a5cc6a48a09664fc42f0e0b6c8.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_7f09d60bbbda4aa091607080b70a625d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/what_was_the_first_denomination_of_christianity.pdfIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_fd2b4a5e100543b5856edbd0d0d51e15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufexa/ditudegilepolojuzeb.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/washington_post_obituaries_1996.pdfIn PDF document text
    • http://fanodawenu.rf.gd/brand_guidelines_indesign_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/fopubosixegeb.pdfIn PDF document text
    • http://dunizolosonon.rf.gd/vemuxibolome.pdfIn PDF document text
    • https://f6142301-0c02-44dd-b2c5-62cf9b3cd0dc.filesusr.com/ugd/ebfdba_6c0c2e3d4e1d42c88f8fcc713d043b12.pdf?index=trueIn 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_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 5220 bytes
SHA-256: e683e5ff45965f51706e6bb9da4b7e6b4e7a40bf98e20fc3d85cc1453c4109b4
font_01_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 1796 bytes
SHA-256: c9c850e9c351ce199d5e9d1c42a783cd39d33267a74ccb43d8a2fed304f07254
font_02_sfnt_off00011467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11467 10748 bytes
SHA-256: 28fe5522f1692be5d72a82d36125447ceead02cfa96a1d7a431d23c24473280a
font_03_sfnt_off0001395f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395F 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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