Malicious PDF — malware analysis report

Static analysis result for SHA-256 af68f52aab6e53b6…

MALICIOUS

PDF

81.8 KB Created: 2021-03-15 13:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 01a0aa1ae0aa916b5c452c05be3b5860 SHA-1: d2257e70d96ceb2b5dad6a9af0867c90cf5a5574 SHA-256: af68f52aab6e53b6a9aedf0f6b2f34c7cb083bfe660c03b8410cec44d5de05eb
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=kerbal+space+program+breaking+ground+guide In PDF document text
    • https://cdn.sqhk.co/terisuzuji/dgdijZs/sutoxebolifeluluti.pdfIn PDF document text
    • http://fitnesspack.net/2499720385ql2l.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/chhajiG/sozitudajidil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_601995c3eb8a3.pdfIn PDF document text
    • http://pavuzebeveju.22web.org/ford_555d_backhoe_parts_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/ualichi/rogabegoxoj.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/78036551051.pdfIn PDF document text
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/datifuj-kisuvemo-pawikusizitopud-motoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5fdb6e205a028.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/gejhEgc/guess_the_pic_word_game_answers.pdfIn PDF document text
    • http://servempieza.site/54099047038tjaqc.pdfIn PDF document text
    • http://radogomi.mygamesonline.org/88892217670.pdfIn PDF document text
    • https://relowuforobelo.weebly.com/uploads/1/3/4/5/134528439/2124955.pdfIn PDF document text
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/zulegugikegejon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_601be0a1bb4b7.pdfIn PDF document text
    • https://siwukomeje.weebly.com/uploads/1/3/1/3/131383380/roranadawuverowidoma.pdfIn PDF document text
    • http://mynasert.online/nike_air_force_1_custom_paint_splatterlkkts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_6015a0fac3d84.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/us_navy_seal_training_schedule.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/miruxurinuw.pdfIn PDF document text
    • http://shoop-fn.ru/23512435033fk3h0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_6032e33b20941.pdfIn PDF document text
    • http://gufutaca6.xyz/harry_potter_book_series_authord7u0s.pdfIn PDF document text
    • http://mixutadumekaje.mypressonline.com/3045523105.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xamukuxoze.epizy.com/energia_de_biomassa_florestal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 5368 bytes
SHA-256: 7343def326429b4fd9661f13f39ce4056b796e18de50013f7c63727dc5e18c51
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 11464 bytes
SHA-256: db5612db54a28dffa355346c28f2b4b49e602b9b476456cc7cfd1bfd5031feaa
font_02_sfnt_off00012ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3