Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b85e3246b775c2…

MALICIOUS

PDF

66.4 KB Created: 2021-02-28 04:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: e1ad79fb8002053547393df7e07531ea SHA-1: f67a5d164947b40c90f55744d15f80b725e46992 SHA-256: b4b85e3246b775c2a9390b7077c84a6eb261b97c6995ae77f7dab350e628932e
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=bosch+es4-1m+wir+thermostat In PDF document text
    • https://xaroduzorosu.weebly.com/uploads/1/3/1/3/131398324/6d7e8416d65f66.pdfIn PDF document text
    • http://sdek-24.cc/xuxuduxajojikefutepujexeatsbv.pdfIn PDF document text
    • https://radufogerexe.weebly.com/uploads/1/3/4/2/134265868/8940293.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/m2n68-la_drivers_windows_7_32bit.pdfIn PDF document text
    • http://vinograd.io/equivalent_ratios_worksheeti691p.pdfIn PDF document text
    • https://vutuwoti.weebly.com/uploads/1/3/4/7/134720014/a25c4f55.pdfIn PDF document text
    • http://winoraama.site/baby_bumblebee_nursery_rhyme_lyricsol5qg.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/17364531328.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/zugutixe/formal_amendment_definition_government.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/pharrell_williams_blurred_lines.pdfIn PDF document text
    • http://girofili.myartsonline.com/how_to_get_merit_badges_fast.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/59691142441.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/68130029860.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/zuwokemagivobalamerebo.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/42907318492.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/8349293426.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_off0000c836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC836 5320 bytes
SHA-256: 9c9efa52c5603bc86b933aea0fd802cbb083c66ad9eb7e6eb0cdbbff7fdb2777
font_01_sfnt_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 10148 bytes
SHA-256: 810ad44d29b592ea8f4aeca0ba9eba7969870f76adf1c63289a7911dc7355d7e