Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bf4e94891c8c1e…

MALICIOUS

PDF

69.9 KB Created: 2020-11-10 02:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7d82ad4db6d2d829933c0b31796a51df SHA-1: 9fd1ec65f62f9a62de723b880ebbe20c7b7633be SHA-256: a0bf4e94891c8c1ede1a2f565a7349af7625e24ee83d201532a2987719b1f65f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links to malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. It also functions as a link farm, directing users to numerous external PDFs, one of which is hosted on s3.amazonaws.com. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

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
  • 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/123?keyword=rehearsal+dinner+invitations+free+downloads In PDF document text
    • https://ravusosu.weebly.com/uploads/1/3/4/5/134589623/5d9635fbe3ef7.pdfIn PDF document text
    • https://nawajutexi.weebly.com/uploads/1/3/4/1/134108687/pesuk-dobabowitanotek-jadexebuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382972/normal_5f9ca63187aa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_5fa01657b1247.pdfIn PDF document text
    • https://kejedavozeve.weebly.com/uploads/1/3/1/4/131483662/zegowatagipux_funofarafufob.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/vudivuzakal/robux_code_generator_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/vadexuvegubodelired.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87db6da8-b350-4b52-9ce9-dc4ad5a1e381/46777999143.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/1989_range_rover_classic_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a7782d-174c-4c43-a788-c598f95072c7/taxepetitufow.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/77242190834.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/x_men_2000_full_movie_123movies.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD361 5152 bytes
SHA-256: 673c06e2ae552441df7b3a58afb0a8c7c79bbec533e367be79b89c7f02099aed
font_01_sfnt_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 11092 bytes
SHA-256: 0bf4dc199447b23a7f501af83503de2b1d4ddc23a87110ee8ec455fe2a181799

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