Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c083c00ef82a62…

MALICIOUS

PDF

69.8 KB Created: 2021-02-16 02:28:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a519eede7e234f8248d4049c1eaa69b4 SHA-1: 73c2d160f4add6ee7327a7bb01d7702df6baac67 SHA-256: 45c083c00ef82a6225feb7f8a136f853a775d1ac41528a6b92f6dcdf6b5bff68
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to S3 buckets, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

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
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+do+the+advent+candles In PDF document text
    • https://cdn.sqhk.co/pobijejok/NNihchh/widaku.pdfIn PDF document text
    • https://wusatotaluvak.weebly.com/uploads/1/3/4/4/134469206/lavizavagewen.pdfIn PDF document text
    • https://radewisuvux.weebly.com/uploads/1/3/4/6/134689192/tovapodikovi.pdfIn PDF document text
    • https://lokudepapina.weebly.com/uploads/1/3/5/3/135325929/78bfc39fe6abbfb.pdfIn PDF document text
    • https://dunogijejuj.weebly.com/uploads/1/3/0/8/130813547/cd29bc495283a71.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/gomaxod/integral_calculator_with_steps_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/federal_code_of_judicial_conduct.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/manualidades_alimentacion_de_los_5000_para_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/fugoxegasotefe.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/midas_m32_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/varekuvuzetakojamanazomu.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/baden_wrttemberg_schulferien_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/latex_poster_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/blessings_of_bapu_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/spider_gwen_wallpaper_s.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/rc_truck_brushless_motor_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/browser_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/go_to_market_strategy_powerpoint_template.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_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 5044 bytes
SHA-256: d56e5112aec08ec07530c78a47c0951554896d41413d7980655c066b45094b37
font_01_sfnt_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 10164 bytes
SHA-256: 622e64d952ee0c78e0e847d15e61d05ce7d60a3f37c1ed69939b0c674a16a233

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