Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4b0d33c9925b8a…

MALICIOUS

PDF

42.8 KB Created: 2020-11-08 02:52:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 65aa8c652cf1a1c7b8618dc92b6a1b2f SHA-1: 33e8f776cc17d634adff91160211ffac7b41e86c SHA-256: 9b4b0d33c9925b8afcf21125f0c6db5ed30ac91b2b57d490deee3ce0dab8edf8
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://trafficel.ru/123?keyword=word+with+aid PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5f938fa61e329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f8abd7159140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5f927da860730.pdfIn PDF document text
    • https://fugikoji.weebly.com/uploads/1/3/4/6/134611078/kudewakosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5f89f75d5e5b5.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/8071333.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/de2b0d9a-909c-48f8-8ea7-364121fe7742/kafejex.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/hey_sister_soul_sister_lyrics_patti_labelle.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/45145868105.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/46353847528.pdfIn PDF document text
    • https://rotixit.files.wordpress.com/2020/11/led_strip_light_circuit_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/rajodafejinojile.pdfIn PDF document text
    • https://s3.amazonaws.com/damevusom/52948773400.pdfIn PDF document text
    • https://totizawagu.files.wordpress.com/2020/11/calisthenics_meal_plan.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_off00006d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D21 4808 bytes
SHA-256: 8bd5a64241696b9a49fe007128a48d4ab6821db60e556fcf4d7677ceccda7c19
font_01_sfnt_off00007d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D89 9820 bytes
SHA-256: 786140bf88347953ddd077d1a648eff49479a145b6faa20b4c34da773ef327ad