Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30c66bd8852af6c…

MALICIOUS

PDF

103.2 KB Created: 2021-01-03 14:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cfa1e785702b0e0745d8df4ca299e349 SHA-1: d84e37457a7abd6d6fb0da9b7bacc02d6901be9f SHA-256: c30c66bd8852af6c1404974a2d2d08ba0e9cdfaf21f1fb62984b89ebddd2cad6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, with a critical heuristic detecting a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious sites, likely for malware distribution or credential harvesting. No scripts were extracted, but the PDF's nature points towards a social engineering attack.

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
  • 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.
  • 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://trafftec.ru/aws?utm_term=frontier%2528+2016+tv+series+parents+guide PDF link annotation
    • https://cdn.sqhk.co/todusukiraxi/UhiZeZQ/virus_alert_on_iphone_11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5f8cb7e50a89a.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/RghdMTo/12406321299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_5f939029c74a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_5fbd561698a73.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxiniraz/g1ifOVj/walking_dead_rick_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/gmughgj/can_you_escape_room_tampa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422627/normal_5fb5086f03e29.pdfIn PDF document text
    • https://gabatilijoden.weebly.com/uploads/1/3/4/7/134730515/756ee26558b8eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385636/normal_5fec2242083b0.pdfIn PDF document text
    • https://mufobaxepomek.weebly.com/uploads/1/3/4/8/134866816/1084006.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/zebarufuridorur/appvalley_apk_for_android_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/dipozatawuwevazor.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/child_protection_mandatory_reporting_nt.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/wegolupivotanunipuno.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/44364279179.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_off00015235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15235 5668 bytes
SHA-256: 9d416d9ff049e6561a8eb3766363cb31edd9d4f7cc97b0055f0e09c2f464b89f
font_01_sfnt_off000165a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A1 12976 bytes
SHA-256: 2398aafb500a6752d08f1c964bd79b9eb34f29ccc5d0b0a3e8c09cca5132182a

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