Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e54728bb4ff93f…

MALICIOUS

PDF

38.6 KB Created: 2020-11-09 10:24:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: aae50c70fe673470ebc48bc424adb910 SHA-1: 8a22b6d44ce6ef068a22f432d2e430d3791af70c SHA-256: 81e54728bb4ff93faceb4401701b75dd2a8f9f305bce1a9c4e09fb59806d698b
136 Risk Score

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://trafftec.ru/aws?keyword=ver+transformers+3+online+latino PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393762/normal_5f8fa10706642.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbda1d97-be32-4184-8a35-e604efff4d46/wubamesa.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/tipelejajigowagalevewe.pdfIn PDF document text
    • https://salesaneza.files.wordpress.com/2020/11/maggio_trumpet_method.pdfIn PDF document text
    • https://sirilab.files.wordpress.com/2020/11/mujalego.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/70011368699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3890e026-697e-468c-870a-0db3c9962dce/50999533688.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/gazetabaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c4488a-c911-48f2-b06e-2100470526bd/60866528575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7805605c-f1a2-4048-b153-94deec6188d2/r_r_auto_sales_sc.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/68091325827.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_off00005928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5928 5040 bytes
SHA-256: 01efaae2576abea9dc82c73fa74dd9dede49da7ac2961328de02a553b5ebc2ef
font_01_sfnt_off00006a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3A 10556 bytes
SHA-256: 8aa9e105c68d3cce0575ac28533c9cec2885206d4c1402df9203a67ed2cc8e99