Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc58a5d3b80e4b8…

MALICIOUS

PDF

69.4 KB Created: 2021-02-13 07:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 91cf73f88cb4c44309699b2fa4a02a5b SHA-1: 7d80ae411a402830460e612f9b7a2fea1bc73581 SHA-256: 4dc58a5d3b80e4b8c0ebc668f860473d7530e5ec7073caa9dd14c4d2bfc4e7fe
196 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
  • 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://seumenha.ru/wix?keyword=genetic+mapping+worksheet PDF link annotation
    • https://sikapekit.weebly.com/uploads/1/3/5/3/135317012/8705643.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/jeZchiJ/adventure_academy_cancel.pdfIn PDF document text
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/xutapufikamisezox.pdfIn PDF document text
    • https://bukowimulo.weebly.com/uploads/1/3/1/4/131407836/tomojizov.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/ihgimji/bezotomejaxu.pdfIn PDF document text
    • https://tamoxukezoge.weebly.com/uploads/1/3/4/5/134585929/ad21d91a8.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/Havjdml/nerf_zombie_strike_brainsaw_blaster_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/meradipuwiz/gjAijwk/force_master_chief_smith.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/prioritise_workload_interview_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/carol_of_the_bells_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/56998162604.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 5292 bytes
SHA-256: bc00baf4ca36657c2ad886d67dccd2c224fe6ea08d52a786b5b29abdf1625e84
font_01_sfnt_off0000d7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 10352 bytes
SHA-256: 66e010c30b021417e723a9b24c36cceb582920927858f78399ac6ef847476756
font_02_sfnt_off0000fb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3