Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1c0803a15953e4…

MALICIOUS

PDF

87.3 KB Created: 2021-02-25 08:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ecabf423ccb2204a35e1598d5fa8e466 SHA-1: f935f51bc7208a1efa5fd94bdc1086c732290596 SHA-256: 7d1c0803a15953e439da1b7bc59adf59c54be639b62c9a128158822c0a9a206b
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The ML classifier and ClamAV also strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'descartes second meditation', likely to disguise the malicious intent of the embedded redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/strik?utm_term=what+is+descartes+second+meditation In PDF document text
    • https://zolaverapudo.weebly.com/uploads/1/3/0/8/130874102/9566574.pdfIn PDF document text
    • https://wunobenera.weebly.com/uploads/1/3/4/8/134887230/5284578.pdfIn PDF document text
    • https://levalezekavazif.weebly.com/uploads/1/3/4/6/134639406/7959501.pdfIn PDF document text
    • https://xufidevudog.weebly.com/uploads/1/3/4/3/134389214/kupilekoxisomigalu.pdfIn PDF document text
    • http://pifozuvarivin.22web.org/toshiba_tv_input_button_not_working.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/5355902.pdfIn PDF document text
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/deseto_ridedo_vamurukarekiv_mamurokidufimi.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/juliziwojatige/70063937148.pdfIn PDF document text
    • http://wubavon.epizy.com/puwasiraf.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/getubidetuxevuwijevunas.pdfIn PDF document text
    • http://lagunuriteg.rf.gd/dewey_decimal_classification_for_autobiography.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/16693744026.pdfIn PDF document text
    • http://jezawirigi.epizy.com/batixunavaj.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/sesofoner.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/ladenusezubosuki.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/67455319491.pdfIn PDF document text
    • http://mivuturirem.rf.gd/88875557265.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_off000116c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C0 5160 bytes
SHA-256: 9f56a78559072a4b7d01d7060296c47bb1bb32696e79e2b7affc25ff83d9efe5
font_01_sfnt_off00012828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12828 11296 bytes
SHA-256: cc8b8b82456bcf5e6b26d7712eb20896a2d1e90159e1405e64b608b4e4675cf9

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