Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd68e865b571179…

MALICIOUS

PDF

72.0 KB Created: 2021-02-23 20:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 08938071b1f0d7db7366c5ec10586387 SHA-1: b705435fd92e9962bb27a341514cdf7b331fa88f SHA-256: dfd68e865b571179bd8dc4346b2cbbd81edc0e485a496ffb148377ced23ec809
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

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://maypoin.ru/123?utm_term=ap+human+geography+princeton+review+pdf PDF link annotation
    • http://obschee.xyz/46857378825by03b.pdfIn PDF document text
    • https://cdn.sqhk.co/buganisazobu/6agjijj/64542914774.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/6eaimf0/castle_defense_2_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/giNigie/99136648037.pdfIn PDF document text
    • https://miluxeto.weebly.com/uploads/1/3/5/3/135326788/sowidanutotewud.pdfIn PDF document text
    • https://xefulexemifin.weebly.com/uploads/1/3/1/3/131398452/9edc3701d.pdfIn PDF document text
    • http://xtw2.club/xelakigokqu9ww.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/8fhigjx/apple_afterburner_card_adobe.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/4VZZThf/86482253364.pdfIn PDF document text
    • http://ideal-it.fun/rectangular_and_circular_waveguide2pd93.pdfIn PDF document text
    • https://cdn.sqhk.co/fetebutujo/RjaRje0/teresufufebevasax.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/DyogjE8/88521967532.pdfIn PDF document text
    • https://cdn.sqhk.co/jenexovu/jhzTigT/color_switch_happy_wheels.pdfIn PDF document text
    • http://geniusenglish.space/soxisayf0xy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 5604 bytes
SHA-256: d6226eab0ff199d59ccc389de4687b05cff1bc82231809b5639d4bd93ea3c42c
font_01_sfnt_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 10668 bytes
SHA-256: 1271da9de80e770147efae9fab11ec18cb48d5b0d9b3996b441a0b476fb007c3

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