Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f7ca3ddc3425c8…

MALICIOUS

PDF

79.1 KB Created: 2021-02-02 22:30:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a2b4df5c5778e3382da86e7a38508539 SHA-1: 423a265abf44ddb109688093c1daae328fa15556 SHA-256: d4f7ca3ddc3425c873319314dcdd31f050131360829d616924a86541bf77ce26
222 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=google+drive+forms+templates In PDF document text
    • http://copytoshka.ru/xuvesuw5mwbv.pdfIn PDF document text
    • http://stebsmeh.space/guitar_major_pentatonic_scale_patterns2ikbq.pdfIn PDF document text
    • http://pressit.space/nfs_underground_2_full_indir36v2t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_5fd712ada6736.pdfIn PDF document text
    • https://bewebisiseten.weebly.com/uploads/1/3/0/8/130874130/5563198.pdfIn PDF document text
    • http://kir.center/waxolewoworamulujoselb1kzc.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/gekixadonuru/brder_grimm_aschenputtel.pdfIn PDF document text
    • http://sulovibox.epizy.com/amphibians_information_wikipedia.pdfIn PDF document text
    • http://gokamevagared.epizy.com/xuvexivivejun.pdfIn PDF document text
    • http://rebivik.epizy.com/46_bike_race_video.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/nesa_accreditation_report_for_proficient_teacher.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/45598591822.pdfIn PDF document text
    • http://nidikofuwovi.rf.gd/dekotenalogad.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/68114719199.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/blessings_on_me_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/mrna_codon_chart_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/mugirokavatatixabiberiw.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/make_cv_online_free.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_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 5452 bytes
SHA-256: 587e3265ebd835022fba4fbd148cdc09d669b4b85efaf2faf88e71be0ff67cb7
font_01_sfnt_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 10448 bytes
SHA-256: d1ca636431cad789fb4c7a757c27ee956641c1688268d351ff947ae3350b0bc9

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