Malicious PDF — malware analysis report

Static analysis result for SHA-256 61851c54be47f6c7…

MALICIOUS

PDF

80.1 KB Created: 2021-04-06 13:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dd644c5b69b14ad871490e58abf9310b SHA-1: c35b7aa07f4b038d3dc24bb02b8f103c5d91515b SHA-256: 61851c54be47f6c7068c563b55a83b04ef40e40f884534e2fb6f6fa72f241fb8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://maypoin.ru/wix?keyword=madden+20+draft+guide PDF link annotation
    • http://fopekoriw.sportsontheweb.net/computer_basic_information_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/rorifugera/ihf0gie/33465331730.pdfIn PDF document text
    • https://xaxexuwolak.weebly.com/uploads/1/3/5/9/135978614/4204429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_602d87c85946e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_6064ae112a73b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_600ae38497daf.pdfIn PDF document text
    • https://cdn.sqhk.co/daxozazon/ge0hfv6/abdominal_ectopic_pregnancy.pdfIn PDF document text
    • http://bifozitixexidad.mygamesonline.org/augmented_reality_ieee_paper.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427079/normal_5ff9c3ff0a2fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480898/normal_5fce186fbfd5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492257/normal_5fe2436c6651b.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/Dijghii/reverse_easter_egg_hunt_pacifica.pdfIn PDF document text
    • https://gazikurow.weebly.com/uploads/1/3/1/4/131452893/e5e6ff13c9.pdfIn PDF document text
    • https://sojuvamufivuleb.weebly.com/uploads/1/3/0/8/130874470/13ded.pdfIn PDF document text
    • https://lexikusu.weebly.com/uploads/1/3/1/4/131438729/4578941.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xirofapinowud.atwebpages.com/present_and_past_tenses_exercises_intermediate.pdfIn PDF document text
    • http://davinawoguzag.atwebpages.com/2020_mercedes_c350_owners_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 5144 bytes
SHA-256: ea30f2fa90ff7d787979a63de52f1236737bc62b570dcc8977e3c322b52a0b20
font_01_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 10788 bytes
SHA-256: f01f848add9d014fd97f4897153d12e532e1d48ac7926ecd58787117e7655be5
font_02_sfnt_off00011d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 16080 bytes
SHA-256: 682b98d0697bd8628c40f5b2c6a4ead5ef93030e01f9f6be6c9ec1be1f6504e5