Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19f7881984bc0b9…

MALICIOUS

PDF

46.6 KB Created: 2020-11-08 01:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: d92be9e5837864befbb1dc9f41118b5e SHA-1: aae91e405c78f2f42a27bd2f13114ad87b44fce8 SHA-256: e19f7881984bc0b95244b8c9a93a1b2d9900a905223e0e9c1a3db24a97d17f35
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=strike+force+heroes+hacked+unblocked+games+77 PDF link annotation
    • https://vigaziwow.weebly.com/uploads/1/3/4/3/134322068/8077046.pdfIn PDF document text
    • https://komimuvupelogi.weebly.com/uploads/1/3/4/3/134312664/dubufeka.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/9c0541618c593b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gozevawu.files.wordpress.com/2020/11/valefegakis.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/dr_seuss_printables_for_toddlers.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/fast_bowling_techniques.pdfIn PDF document text
    • https://bojugese.files.wordpress.com/2020/11/momumomutezafubavatit.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/fefib.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/xeloduxubazotesijapu.pdfIn PDF document text
    • https://zixowamo.files.wordpress.com/2020/11/torah_hebraico_portugues.pdfIn PDF document text
    • https://zidudadeg565145698.files.wordpress.com/2020/11/prentice_mulford_thoughts_are_things.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/30000281515.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/76474139108.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000645b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645B 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off00007540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7540 5820 bytes
SHA-256: 046929027127a4df67bc28b6665c8ac97216b7ed0ef50bada93480430bbe1ae4
font_02_sfnt_off000088f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88F4 10624 bytes
SHA-256: cfc83063ad19d61ade9153518a5c78114c06725122f5f4bc2475650e0f853711

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