Malicious PDF — malware analysis report

Static analysis result for SHA-256 95fd8b79e3543628…

MALICIOUS

PDF

73.2 KB Created: 2021-03-23 13:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f6b4664d80f6e6371f3ee283e1ffe68d SHA-1: df038eca7f2684f7cb880bd3041d79f9d1d4919d SHA-256: 95fd8b79e35436289fd8fcbb946cf6b844a57e6ef8bb6d2841f9663213b8851f
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious redirector links and is flagged by a machine learning classifier and ClamAV as a phishing trojan. The embedded URLs point to known malicious infrastructure, suggesting an attempt to redirect users to a phishing or malware download site. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=pillars+of+the+earth+sequel In PDF document text
    • https://kekageguva.weebly.com/uploads/1/3/0/7/130776826/1240983.pdfIn PDF document text
    • http://dudisukogonox.iblogger.org/modabigijotejapuzud.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/72830485838.pdfIn PDF document text
    • http://labebatazavanoz.mygamesonline.org/19126059149.pdfIn PDF document text
    • https://pefodiral.weebly.com/uploads/1/3/4/4/134476409/nifipasamowaw_felutewena_sazivafaxuwuw.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/gadiviliw.pdfIn PDF document text
    • http://zinuvudoliku.iblogger.org/rasekafe.pdfIn PDF document text
    • https://vesetiwavulajed.weebly.com/uploads/1/3/1/3/131381055/bdd007896818bb.pdfIn PDF document text
    • http://nuwojukow.mygamesonline.org/xibukidamijasolen.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/2704b43c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vokerajud.epizy.com/wusojajeza.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/robin_hood_2010_trailer_german.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/whats_the_theme_of_treasure_island.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/psoriasis_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/30699100586.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/35200849379.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/nys_pistol_permit_renewal_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/how_to_put_filters_in_shark_navigator.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/misufer.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/83680771190.pdfIn PDF document text
    • http://jejivosijej.rf.gd/36673694677.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/what_is_modified_curriculum_and_instruction.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_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 4980 bytes
SHA-256: ab4547af2ed7ee6bd274c0804c8a0fa54f46a918c15b982bdfcdc9c00d9de873
font_01_sfnt_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 10848 bytes
SHA-256: 18138e2ec0964bf55183cbbda2765da097f17535e5cc963e035ddf20a175db72