Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d1a5099045044b…

MALICIOUS

PDF

56.4 KB Created: 2020-11-09 04:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cbabbd1460efdb7b33a7793219cd519c SHA-1: 2db3dcbaec2957e851aac6a994b7aae60fcba7aa SHA-256: e4d1a5099045044bcd38f35834bd73618ea029c046fa36684f863113d98bbfa5
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which point to S3 buckets and WordPress hosts, suggesting a link farm or SEO abuse for phishing. The primary redirector URL, 'https://trafficel.ru/aws?keyword=hoja+de+registro+asrs', is identified as a lure for free downloads or phishing. The ML classifier strongly indicates maliciousness, and the presence of numerous external links, including a link farm heuristic, supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://trafficel.ru/aws?keyword=hoja+de+registro+asrs PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mutirexa/gebatedenalasidogode.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/character_physical_description.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/93855640946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35d21972-b207-4c68-9a4d-39211b38023f/51558317730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a222a698-65fd-4fb5-bc1c-2c561f586ce6/remuvizexoneniw.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/animal_behavior_worksheet.pdfIn PDF document text
    • https://zixixesowaxa.files.wordpress.com/2020/11/civ_6_war_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/xufateta.pdfIn PDF document text
    • https://tafexoru.files.wordpress.com/2020/11/3294531957.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/gesobuzepilalan.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/calculus_integration_formulas_in.pdfIn PDF document text
    • https://fovodifikade.files.wordpress.com/2020/11/xitabuxaradozazurobuvuk.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_off00009ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EBF 5000 bytes
SHA-256: 245355b6958d507c22b46b57b50a087f5bb7ef0123bac193cc7e7e6101f906d1
font_01_sfnt_off0000afd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD0 11000 bytes
SHA-256: 967068d76c1b94fbcb8b79a0b4de48dcba28e16e4570b324aaf3e417fa8754be

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