Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90b670f0fec2809…

MALICIOUS

PDF

72.5 KB Created: 2021-03-31 22:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f2fa2c19416a7a4b6379bec41031ef6f SHA-1: 7e919f01cf6cfc663994c647e4684e5af5b8d781 SHA-256: f90b670f0fec2809e009fe946711b00b399aed28b181c5f970f7ce15468193c3
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating that at least one link points to known malicious redirector infrastructure. The document's structure and the presence of many distinct hosts suggest it functions as a link farm designed to lead users to potentially harmful content. No scripts were extracted, but the overall pattern strongly indicates a phishing or redirection attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=adding+subtracting+fractions+word+problems+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_6058af0818b4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467017/normal_5fdd33a57f1b5.pdfIn PDF document text
    • http://samelike.site/91069530683lmapy.pdfIn PDF document text
    • http://tomandbxof.site/descargar_navy_field_2_pcvuq20.pdfIn PDF document text
    • http://mnogoturov.com/after_world_war_ii_the_automobile0iwkh.pdfIn PDF document text
    • https://vajojesorenum.weebly.com/uploads/1/3/0/9/130969616/099d9cd2e6.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/78431511830rc4yw.pdfIn PDF document text
    • http://mosdendy.store/457704903804oavk.pdfIn PDF document text
    • http://secureappeal.com/why_is_my_doss_soundbox_not_connecting61194.pdfIn PDF document text
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/kutefose-sewifesad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450731/normal_5febfbd8a1edb.pdfIn PDF document text
    • http://milanbeachs.space/how_to_clean_wolf_oven_grateskalp4.pdfIn PDF document text
    • http://kprovk.xyz/jomomupaxetewp480.pdfIn PDF document text
    • http://myshoes.moscow/11563988220d0thu.pdfIn PDF document text
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/kuxuwibar-zefupovifuzun-kiresixasax.pdfIn PDF document text
    • https://nukusuruv.weebly.com/uploads/1/3/1/8/131857442/8614610.pdfIn PDF document text
    • http://avtoshkola-region26.ru/side_by_side_third_edition_book_1_audiovaoin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500878/normal_602f9d8000ef3.pdfIn PDF document text
    • http://portkamesto.site/device_care_apk_downloadz331p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_8ab8007eed3443f49ce1a8c0a272e8a6.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_e6f604e351e24ecdab6c578d617056b1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 5856 bytes
SHA-256: 7220bf0163222a096e2fdacced63fe85974b60d21f574526f5a5f954dd4d7838
font_01_sfnt_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 10488 bytes
SHA-256: 913327fecd70d21e909a3b35d1968e562176f35f40aa637295a075e8380d942b