Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43749fd34624756…

MALICIOUS

PDF

71.3 KB Created: 2021-01-29 12:46:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 6c8c07f71dd2ce8440109bae253cfe30 SHA-1: b74348ba1c20793d782fed2f4ab1bbe87593b1fd SHA-256: e43749fd34624756792a55243cee0f0eb331a67ee95a0518b9d3dd881cb1c8a8
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/wb?keyword=bearded%20dragon%20for%20sale%20craigslist In PDF document text
    • http://gerawat.22web.org/brahmachari_old_movie_songs_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/cjfeZ2Y/funny_jokes_and_riddles_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/woledowo/hbbpjaL/hsl_recliner_chairs_and_sofas.pdfIn PDF document text
    • https://wuwosafojopog.weebly.com/uploads/1/3/1/4/131407683/sifofuv.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/iUcjdLX/53033456762.pdfIn PDF document text
    • https://zomutelisofo.weebly.com/uploads/1/3/4/7/134712892/jokug.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/xezonijida/20963584432.pdfIn PDF document text
    • http://surewefuwiba.rf.gd/zofutesozig.pdfIn PDF document text
    • http://nezenomawaza.epizy.com/airplay_dlna_receiver_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/teaching_cv_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/dujavijupegabalifetira.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/battlefield_bad_company_2_apk_data_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/60695609674.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/ubuntu_font_free_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/ruvowov.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_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 5240 bytes
SHA-256: cf52b4ed85ce0e59159e7e63490bcb19a9bb34b5cb9eb7d0aecc04d2aef5d370
font_01_sfnt_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 10120 bytes
SHA-256: a9f6638f397b0da717b4419bdf9fbfded1a57d52e44e4efa3fed1df3a2bf67b5