Malicious PDF — malware analysis report

Static analysis result for SHA-256 936406bd39e0535c…

MALICIOUS

PDF

70.1 KB Created: 2021-02-21 04:03:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: ace5e22b918abf4db5335921541cd60d SHA-1: f4e65872016f553fe309361d2c3ec3274dd2b052 SHA-256: 936406bd39e0535cba65beba9175af9539ed6cb28e1bcf287dc4ad64e79bf750
262 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=simcity+deluxe+apk+mod In PDF document text
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/makixefilotiz_vonenobug_pezoxonemanapon_daveboxozuri.pdfIn PDF document text
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/lowarobovebuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393028/normal_60035395740e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_6023f214d144b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414864/normal_5fcad70290666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_6029440ebe07a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375080/normal_600007d4d7bc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_5fd619c23fd73.pdfIn PDF document text
    • http://rezotu.xyz/concrete_and_abstract_nouns_worksheeth89qb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375907/normal_60021f328ced8.pdfIn PDF document text
    • http://contact-git.top/eine_kleine_nachtmusik_music_sheethwhn7.pdfIn PDF document text
    • https://magijomolalol.weebly.com/uploads/1/3/1/4/131437319/dubadajetojidi-pagepimaxul-kumufobuzem-pogoviwe.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/cLrjejc/86054393222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5fee92e552348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wupeguliv.epizy.com/beaconsfield_state_school_uniform.pdfIn PDF document text
    • http://wigegamumuxan.rf.gd/animal_sounds_ringtones.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_off0000d3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A4 5280 bytes
SHA-256: 07cbe3723d4a129433eeb005a0163e3c209044c5bdf26f92fa50f78428fba3f6
font_01_sfnt_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 11052 bytes
SHA-256: 6bfc89e5841b21bc5a9c078753892a44632abdbe650c30beddbd0877cd76b584