Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a939c7dfcc54f1…

MALICIOUS

PDF

72.1 KB Created: 2021-02-24 08:28:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 1e72eb3e9e336d5097deac5379589e9f SHA-1: afdb67380a9926c88d32d625c65c233be1e46f4f SHA-256: 27a939c7dfcc54f1219aaa10d79def6ee585bcc733d42f196fe19ce50fb3e93f
224 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/wix?keyword=aptoide+ios+apkpure In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388841/normal_602585b883e41.pdfIn PDF document text
    • http://idealslimitaly.site/xepiwatuxiviledulejilafory90s4.pdfIn PDF document text
    • http://wowurilagufa.iblogger.org/how_to_watch_avengers_in_order_of_release.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492281/normal_6018e276320bd.pdfIn PDF document text
    • http://alcexpress3.xyz/attack_the_light_apk_2020m2m1m.pdfIn PDF document text
    • http://pixxel.life/wimubakifstrah.pdfIn PDF document text
    • http://help-verification.com/882229634961bykt.pdfIn PDF document text
    • http://ecosbor.net/bad_genius_tamil_dubbed_movie_tamilrockerss2nk4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasozazanixe.epizy.com/truck_simulator_usa_mod_apk_obb.pdfIn PDF document text
    • http://lidewez.epizy.com/fortnightly_budget_template.pdfIn PDF document text
    • http://dadagax.epizy.com/aplikasi_icsee_pro_for_pc.pdfIn PDF document text
    • http://kiganume.epizy.com/39077355664.pdfIn PDF document text
    • http://dimonejoxu.rf.gd/regal_bread_maker_recipes.pdfIn PDF document text
    • http://watafewajur.rf.gd/92271383466.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_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 4976 bytes
SHA-256: a1e41e1226d66fc06e3ee06aa3e0f1cc87d4a25467a218bb6d06828f4e64452a
font_01_sfnt_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 15248 bytes
SHA-256: 0cca5bbc32cb4aeda9f750e3811b9a0ead5ccaef3a2316a18e1724b56c0a2857