Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ad674be17fa443…

MALICIOUS

PDF

73.1 KB Created: 2021-02-13 13:08:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5328f225e0260e549d73185853c4952f SHA-1: e1f645bad9c76a262a80b2308f940f454ee2a3b4 SHA-256: d7ad674be17fa443d09fafc5e31604a3907e2553cf307e2e16bb7fae97454a12
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on dynamic DNS services or free hosting platforms, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a common technique for redirecting users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/aws?utm_term=apple+itunes+for+android PDF link annotation
    • https://piturerakilapes.weebly.com/uploads/1/3/0/7/130775197/gevusufanavodebani.pdfIn PDF document text
    • https://dexulivixuwe.weebly.com/uploads/1/3/0/7/130739852/wuwibena-mudufilike-tumabineta-ligezobokukifej.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/120878.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/662ab576a44ab9.pdfIn PDF document text
    • https://vozoduxi.weebly.com/uploads/1/3/2/8/132815828/jewebivugumuvu_xetabagopafo_wilomugobuwe.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/9245547.pdfIn PDF document text
    • https://tapajiwegunet.weebly.com/uploads/1/3/1/3/131380495/a1ff10f0.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/5978b0932640ebc.pdfIn PDF document text
    • https://gotedimonov.weebly.com/uploads/1/3/4/7/134761190/1ec2d00a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mixexomamag.rf.gd/androides_dragon_ball_z_fotos.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/idsa_guidelines_fungemia.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/free_magazine_layout_templates_for_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/printable_thor_stormbreaker_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/jizedijonorurigikev.pdfIn PDF document text
    • http://dilalixurapa.epizy.com/nukugawotigedijodatoz.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/nijup.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/free_english_to_afrikaans_translator.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/application_form_for_short_term_disability.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/assured_shorthold_tenancy_notice_requiring_possession_form.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/38942770009.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_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 5024 bytes
SHA-256: e4c618b8fc7fffcb7a0de4b8c7c3bbb97cbe0fb86e6fc7c2fe5e9d19902f852c
font_01_sfnt_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 10508 bytes
SHA-256: ac02e361251c6e94acb3187863a2d611eeb1815b1bdbbb3bb58029ca69fec431

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