Malicious PDF — malware analysis report

Static analysis result for SHA-256 16128544ae8821ff…

MALICIOUS

PDF

75.3 KB Created: 2021-03-19 14:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cb05be1e5e136b925dcbf3a4627a876f SHA-1: 961085c1a3d25e2408c7bd82c1210745a1a57128 SHA-256: 16128544ae8821ff1fa3ea4abf339de83db233069379e001654e2186e315e0e4
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://druttle.ru/wix?keyword=is+our+constitution+still+relevant PDF link annotation
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/tanuzutevufujan.pdfIn PDF document text
    • http://emirofficialzm.com/consulting_contract_template_canadapfqxc.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/psychology_statistics_for_dummies.pdfIn PDF document text
    • https://wimunalowuzew.weebly.com/uploads/1/3/4/3/134360992/lutopofa-futifo-sopidawizutojex.pdfIn PDF document text
    • http://save50it.pro/xosoxinabejijavowartgxme.pdfIn PDF document text
    • http://zuzitijimopa.22web.org/goguvufirijovami.pdfIn PDF document text
    • https://fixajunize.weebly.com/uploads/1/3/6/0/136051507/titidu.pdfIn PDF document text
    • http://xuxuxib.iblogger.org/holmes_air_purifier_filters_walmart.pdfIn PDF document text
    • http://kazotapojiwi.mywebcommunity.org/what_is_the_easiest_way_to_learn_russian.pdfIn PDF document text
    • https://nabikiwajozipaf.weebly.com/uploads/1/3/5/3/135391661/6979230.pdfIn PDF document text
    • https://samabuwe.weebly.com/uploads/1/3/0/7/130739499/7622204.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/remufuzu/41295460410.pdfIn PDF document text
    • http://gesejovefovu.rf.gd/11793392159.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/zujiwababazoz.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/64150116260.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/18182551118.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/32026858844.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/22863174270.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_off0000eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 4792 bytes
SHA-256: 114b5415e4e2e3fd73642473e0453cfc8e89ed857e5dff5b1d968b942c70ddff
font_01_sfnt_off0000fb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 10808 bytes
SHA-256: 2851ef43a456bcb90c97022f319c6e783fdf606462abfdbbb8370ae354a01e65

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