Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47a9c3c0ecf173a…

MALICIOUS

PDF

59.3 KB Created: 2020-12-22 06:08:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6d8ae67535c5a99608d5f6b44ab0a2d9 SHA-1: b5c24071abbe8fdfb9ab7e219c49cf2edcf64cd3 SHA-256: f47a9c3c0ecf173a8e888e08bdad1b97f82826db40beb7a7f47d274fea732999
222 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a critical finding for a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://cctraff.ru/strik?utm_term=car+driving+parking+games+download+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405638/normal_5f9250fc563fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465555/normal_5fb9bf19d0371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_5fa61fec3972f.pdfIn PDF document text
    • https://ruparowix.weebly.com/uploads/1/3/4/3/134350000/nizarulupunegojadam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379371/normal_5fc875156ab92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5fcb616cd0dae.pdfIn PDF document text
    • https://vizosajigu.weebly.com/uploads/1/3/1/3/131381839/2f73ad8191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383687/normal_5fdfc1585bb98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452199/normal_5fbc308c2c423.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f079a246-cfae-4603-b430-d4f0ea9989d3/eve_echoes_market.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/kumuvanesuzebi.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/teyemm_c3_bcm_etmeka.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10523b8467722f1d4eb82/t/5fc7f6c5dd0d500205bdf777/1606940358103/samsung_push_service_has_stopped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0592bcf-e25c-49b3-ac80-0aea2f1f95dc/cooper_discoverer_ms_245_75r16.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_off0000ac32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC32 5400 bytes
SHA-256: 877e9a20a904dac0ee87c3f8d5119e39ee025f4b030d9f943a4259e7783c51b7
font_01_sfnt_off0000be92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE92 9896 bytes
SHA-256: 07b0b7497d28dac14fbcc06e7bfcca1dbb1cb999b7318cbe596c76b21eb33fc4

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