Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0b3c361880b8f2…

MALICIOUS

PDF

79.6 KB Created: 2021-06-06 03:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51621a8f2b0ce034913476134945ec9f SHA-1: 306a1b490ffb40717a6a7be1a26dab09f7c2d1be SHA-256: 6c0b3c361880b8f2c416a69d61089b8e974821fd1240fafc94102f943a07efe1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as part of a link farm. One prominent URL, 'https://queure.ru/wb?keyword=hp%20pavilion%20dv6000%20troubleshooting', suggests a lure for search engine traffic. While no scripts were explicitly extracted, the PDF structure and the presence of external links strongly indicate a malicious intent, likely for SEO spam or to redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/wb?keyword=hp%20pavilion%20dv6000%20troubleshooting
    • https://cdn-cms.f-static.net/uploads/4369503/normal_602e98c75541b.pdf
    • https://static.s123-cdn-static.com/uploads/4366009/normal_600496fe2f0ec.pdf
    • https://static.s123-cdn-static.com/uploads/4385847/normal_5fde1230819e4.pdf
    • https://static.s123-cdn-static.com/uploads/4411922/normal_5ffdc4009dd68.pdf
    • https://cdn-cms.f-static.net/uploads/4477886/normal_602124c43f1cf.pdf
    • https://resevaguwitim.weebly.com/uploads/1/3/5/2/135298688/287933.pdf
    • https://cdn-cms.f-static.net/uploads/4482619/normal_6066ab0f54f4c.pdf
    • https://cdn-cms.f-static.net/uploads/4468286/normal_602a7cc272c4a.pdf
    • https://pifabesi.weebly.com/uploads/1/3/5/9/135958575/xudakid.pdf
    • https://cdn-cms.f-static.net/uploads/4367283/normal_6013a7cbe914f.pdf
    • https://cdn-cms.f-static.net/uploads/4369138/normal_6021a80e4fab7.pdf
    • https://meverofukibax.weebly.com/uploads/1/3/4/6/134620555/vulojale-gifulopuna-tanotomaviguj.pdf
    • https://cdn-cms.f-static.net/uploads/4482207/normal_606b38e4e89e0.pdf
    • https://vabiwedewu.weebly.com/uploads/1/3/0/8/130813601/1150158.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d5a387a-b23a-465d-8492-cda69f58130f/1995_polaris_magnum_425_carburetor_problems.pdf
    • http://gitefov.pbworks.com/w/file/fetch/144465822/tiffany_lamp_shade_replacement_for_floor_lamp.pdf
    • http://lulatigono.pbworks.com/w/file/fetch/144534813/how_to_make_an_incident_report_format.pdf
    • http://nowefuro.pbworks.com/f/free_printable_reading_comprehension_worksheets_grade_7.pdf
    • https://uploads.strikinglycdn.com/files/3692d759-6861-4108-9380-c2e081107fdc/motorola_minitor_vi_programming_cradle.pdf
    • http://rugewenuzed.pbworks.com/w/file/fetch/144426783/english_grammar_test_paper.pdf
    • https://uploads.strikinglycdn.com/files/54165315-1c74-4f4a-95d3-13b729c73112/sri_vishnu_sahasranamam_sanskrit.pdf
    • http://guronavageba.pbworks.com/f/convert_ke_word_tanpa_edit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b9.bin
26fffa550672292c3f19deb31c46d8b63d8bee923ec41a803a63e1e3140d15d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 5680 bytes
font_01_sfnt_off000108fa.bin
a39da078aab02d10465148baa48d7ed99e5c4f14219a4d159ef70fd240c1435a
pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 11268 bytes