Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e90dd8d0a963c8…

MALICIOUS

PDF

73.6 KB Created: 2021-02-03 00:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 04ffb700395ace081084badbef94b901 SHA-1: 36576085cbb9303ba3ce596e6847d5a3c209a37b SHA-256: b3e90dd8d0a963c869f6ed3268fcdbbf52b8a618b528ac7b1f7e7e5799b57c4d
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure indicate a likely attempt to redirect users to malicious sites, potentially for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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
  • 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://jacksth.ru/aws?utm_term=implosion+cracked+apk PDF link annotation
    • https://xovisifolato.weebly.com/uploads/1/3/0/8/130814526/150186.pdfIn PDF document text
    • https://rilokudewagozem.weebly.com/uploads/1/3/4/5/134597993/3910084.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/hsCvcgi/betipigo.pdfIn PDF document text
    • http://fredo.run/83789118799xs26c.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/jcJiigf/padivuwiravulonevepike.pdfIn PDF document text
    • https://wagimudo.weebly.com/uploads/1/3/4/4/134475497/1406998.pdfIn PDF document text
    • https://cdn.sqhk.co/vebudirepo/jgF9hg1/rotator_cuff_surgery_recovery_success_rate.pdfIn PDF document text
    • http://ing-cliente.com/libro_pimpinela_hermanosle317.pdfIn PDF document text
    • https://cdn.sqhk.co/samigimas/dhaFhbg/47940648310.pdfIn PDF document text
    • https://cdn.sqhk.co/siwemawatu/gjggihP/asa_security_context_license_failover.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/d5ibvhc/79579926427.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/baposivarabuj/vocabulary_worksheet_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/bahubali_2_free_utorrent.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_off0000e099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 5220 bytes
SHA-256: f9d4e90020931f25f588314f820fae47d6f7ee58300a20a445f23e57d8e40860
font_01_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 11256 bytes
SHA-256: 6eae43de24f3842857a8595e11dece5cb9fb61a5112d61999493b773c43150b7

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