Malicious PDF — malware analysis report

Static analysis result for SHA-256 636813246eee0615…

MALICIOUS

PDF

73.9 KB Created: 2021-01-28 10:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 64852552a87d18630c0c8a95c3486634 SHA-1: 70c563886b7c1b28c7811f9df462b13353659bc7 SHA-256: 636813246eee0615afd83a2b9f5ddebfbb3321abc1c1433929a71cdf411d822a
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/123?utm_term=the+epic+of+gilgamesh+audiobook+tablet+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424043/normal_5fce36110012a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489595/normal_5febf9511df4f.pdfIn PDF document text
    • http://brumbum3.xyz/98896849251f2ffl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5ffff7c4a2251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5fcccdaa96ec6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5fcca8263e1a7.pdfIn PDF document text
    • https://numetoximo.weebly.com/uploads/1/3/4/7/134717633/nevilonekadawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_600de7773b18d.pdfIn PDF document text
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/xifomaxiji.pdfIn PDF document text
    • http://vorecan.space/puwunogideb5qds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446507/normal_5fcf14ef7b585.pdfIn PDF document text
    • https://zoluvurodozi.weebly.com/uploads/1/3/0/7/130776250/364454.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411696/normal_5fec1b80458b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477651/normal_60048e57d3aef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470962/normal_5fec3a704e693.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/kelukakeb/lonely_planet_cuba_ebook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/wondershare_data_recovery_portable_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/vubakopoletifexile.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_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 5676 bytes
SHA-256: 621cd9794bca83e983754b4d8e0fe6d1a6fbf45e7f04264662c7c14c4c0d5afa
font_01_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 10492 bytes
SHA-256: 6726159aceff19a7a5f646d4494139f761eee0c4cac0b28e3540f2f32d2c3441