Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c853e099bac552…

MALICIOUS

PDF

67.6 KB Created: 2020-11-13 19:14:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5005a2ab2262f79f11bf0c975c58e939 SHA-1: 22a2172dc449b224e23891a3e715a7d3d51526e1 SHA-256: b3c853e099bac552dd056ea88a609f536b9909ef859803dd43a5e6065bce26fe
214 Risk Score

Malware Insights

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

The PDF was flagged as malicious by multiple heuristics, including a critical finding for a malicious redirector link and a PDF link farm. The presence of numerous embedded URLs, many pointing to external PDF files hosted on platforms like Weebly, suggests an attempt to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the nature of the link farm and redirector points towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://gettraff.ru/strik?utm_term=geometry+worksheet+congruent+triangles+answers In PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/ac148a354.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/laresisif_kigadebokenub_bajutinerid.pdfIn PDF document text
    • https://zupusifeduligam.weebly.com/uploads/1/3/4/3/134313264/ketenetigolew.pdfIn PDF document text
    • https://sigoxavofilaza.weebly.com/uploads/1/3/4/6/134697452/d5dad54910ff0.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/xulisege_pewakagiwunixaf_xuposubofakor_wosanuve.pdfIn PDF document text
    • https://poxedavuk.weebly.com/uploads/1/3/4/6/134608045/2418347.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/2250222e-36ca-4bd1-9058-ea947694c699/my_tamagotchi_forever_photo_album_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/istanbul_lonely_planet_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b401c7-2561-4afa-88ac-3b2ed279dc0b/51983504707.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/colorado_springs_police_blotter.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/nom_riesgos_psicosociales.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/weaver_3-9x40_scope_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/kitowipogejawabarav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53594f1a-e7a8-4796-8ff4-9becf1e1543b/6216807428.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_off0000c9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F6 5500 bytes
SHA-256: 56d9e3f0b2795cd533d01f4d8d9e4026a4b9805be1cbffddbd8f094ecfee58c6
font_01_sfnt_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 10948 bytes
SHA-256: a0812644205fecba102d302b487cfa561af7bf9a17c2c2c88d8f7f84c7d568a6

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