Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3ed2ba5fc13166…

MALICIOUS

PDF

72.0 KB Created: 2021-01-10 00:39:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ac26d9ff9d8f01fcee3457086b303569 SHA-1: d011a75d6f696690dfa544d96b56b25fed2b9ae8 SHA-256: 1c3ed2ba5fc131661f3cb0442911ee3bfe63f5f27c0963d8d433c5039a4c1611
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 to benign-looking PDFs, but one points to a suspicious URL related to 'additional medicare tax 2018'. The ClamAV detection and ML classifier strongly indicate maliciousness, likely a phishing or scam lure. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to malicious 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://trafftec.ru/aws?utm_term=additional+medicare+tax+2018+form PDF link annotation
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/4579537.pdfIn PDF document text
    • https://jexenixikejov.weebly.com/uploads/1/3/4/6/134632916/99629.pdfIn PDF document text
    • https://xamorodedas.weebly.com/uploads/1/3/4/7/134714841/nagazo.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/vanowurekonese.pdfIn PDF document text
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/xifofakixusiwi.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/zuwunozafapajew.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/wovitiku/free_photoshop_action_atn.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/balance_payment_request_letter_format.pdfIn PDF document text
    • https://s3.amazonaws.com/lanowilovuviwib/my_book_live_default_password.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/35699249835.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/97419276199.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/cantoria_de_viola_nordestina.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/buds_gun_shop_lexington_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/free_magazine_layout_templates_for_microsoft_word.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_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 5568 bytes
SHA-256: 0a08e7d8153ade70e662905d7962245b4b3106171b5f3ed00b988669d7f435fd
font_01_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 11396 bytes
SHA-256: 26c1d8b822ff67562e58a4b1dc40455f96d2666200136a165063d62eef8df186

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