Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7087089df32a73…

MALICIOUS

PDF

133.3 KB Created: 2021-02-10 10:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 24a0eaa56675fa4da080db4309954671 SHA-1: d2c9b00a250b44b44b39e0945a39af6dd47ea5f4 SHA-256: 7f7087089df32a73d0404411d088eef031859b6a93ef58987a466b40902a08b6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ClamAV detection and ML classifier also strongly suggest malicious content. The embedded URLs are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://crophysi.ru/123?utm_term=policy+analysis+framework+ppt PDF link annotation
    • http://vvinorama.fun/62945088876pyslt.pdfIn PDF document text
    • http://demask.space/airplay_mirroring_for_androidiofcv.pdfIn PDF document text
    • http://gogotmif.space/hit_em_with_the_woahkmg0x.pdfIn PDF document text
    • https://detaxenenikub.weebly.com/uploads/1/3/0/7/130776267/jakesenisef.pdfIn PDF document text
    • http://dkmz1.club/asplenia_funcional_anemia_falciformeh0k93.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/fepadevugu-pifuburem.pdfIn PDF document text
    • https://wamukefak.weebly.com/uploads/1/3/5/3/135324497/2973356.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/ZidNjeB/trucks_off_road_mod_apk_happymod.pdfIn PDF document text
    • https://fiwaluveniwob.weebly.com/uploads/1/3/5/3/135395264/zerowelirejedenif.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/kutebif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/agrahara_insurance_claim_application_form_sinhala.pdfIn PDF document text
    • http://xaramoturowuf.rf.gd/98250929853.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/bemazegazolenevi.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/wixone.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/comparing_fractions_worksheet_3rd_grade_free.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/kigitu.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_off0001cef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEF3 5420 bytes
SHA-256: 3ecdfdaad6fefa635d14b8e03dfeb727aae3660551392793fcf8c88b799176ea
font_01_sfnt_off0001e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E16B 11268 bytes
SHA-256: 5ccdd76c627b9769f6d6d9f10afbe3759a8345713769b3dd511375e96cb7e60e

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