Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c4665afb743646…

MALICIOUS

PDF

78.6 KB Created: 2021-06-03 10:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e5729a89c53e18f3f5ff541a8f198ade SHA-1: 8bd7a7ac83a6801b5331672d54e59c7d78cc6840 SHA-256: 70c4665afb7436469a725c22acce4b0f543b34329743d4f0d34d033dd6137635
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL being https://jottigo.ru/123?utm_term=menu+label+template. The document body, though heavily obfuscated, suggests a lure related to a 'menu label template'. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/123?utm_term=menu+label+template PDF link annotation
    • https://wuguxobexo.weebly.com/uploads/1/3/0/7/130739488/6822829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_6048a69ada0d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474750/normal_606ddf305d083.pdfIn PDF document text
    • https://noribazab.weebly.com/uploads/1/3/1/8/131871745/1629627.pdfIn PDF document text
    • https://bufigolumixi.weebly.com/uploads/1/3/4/2/134234787/bixigez.pdfIn PDF document text
    • https://mawobomogagot.weebly.com/uploads/1/3/4/1/134109187/72a15e73c1f339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_603aea0cbdff1.pdfIn PDF document text
    • https://xadenekowote.weebly.com/uploads/1/3/0/7/130776743/bogepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480589/normal_601875e3ae6fb.pdfIn PDF document text
    • https://dukavudo.weebly.com/uploads/1/3/5/3/135328319/443572.pdfIn PDF document text
    • https://kaxebovirufuj.weebly.com/uploads/1/3/4/3/134399635/46a01a15d1d3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_6052ece33c85c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwedano.pbworks.com/f/11677720012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c18aff8-3370-464c-93b5-6300545e8893/90564195504.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/f/photosynthesis_virtual_lab_answer_key_olabs.pdfIn PDF document text
    • http://zigunef.pbworks.com/w/file/fetch/144479217/guvis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b0ce6f-1a70-4ae2-a447-5a4bc25f247a/lysis_suffix_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c5faf7-f139-495c-9b1c-0dd05c151d7d/tamaluvoj.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144458415/tunegiduwesigibesu.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/f/4319535826.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/w/file/fetch/144555009/wilorowobosid.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/f/bir_srp_filmi_full_izle_trke_altyazl.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/w/file/fetch/144532116/cuaderno_de_trabajo_para_primer_grado_de_preescolar.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_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 4836 bytes
SHA-256: 7f4be35cdc6a1ee2406b5f739204645b42a15a69511b4244949f660a16f2957a
font_01_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 11452 bytes
SHA-256: 85791dd4b43e8d57d2cf3991df8b986cd1fd2c0fe0ceea12b72231d29b4df4f1