Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a70de23be440b1…

MALICIOUS

PDF

79.1 KB Created: 2021-02-12 01:36:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e003f8ba3c5351705340a79b5e67fe73 SHA-1: ca98845684e6b4554c5c571064dc9df9834543c3 SHA-256: a9a70de23be440b1aaeb2db47b088bd00a83421fba5ea875579b61ef8d16401c
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, including a redirector URL that points to a keyword search for 'csr racing apk uptodown'. This suggests a phishing or scam attempt to trick users into downloading potentially malicious software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution.

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://jottigo.ru/wix?keyword=csr+racing+apk+uptodown PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368781/normal_6022c3611f867.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/ejcImgg/jewels_switch_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/simikimira/jcMCgeV/broken_heart_free_clip_art.pdfIn PDF document text
    • https://tolejavufagus.weebly.com/uploads/1/3/1/4/131437822/lofexekuvivabokokupo.pdfIn PDF document text
    • https://cdn.sqhk.co/pulijidapis/eXie0P2/ralikasawibazupevoxuta.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/tudedebij.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/hg2Mjh9/nawuwejabiso.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/cgdUhhf/1831954304.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/Rhdgi5d/davepurozivebama.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460983/normal_5fc8de8072dcd.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/jbLYKhW/gekusanivanudogobigevoxu.pdfIn PDF document text
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/dijekokimes.pdfIn PDF document text
    • http://jisijopimif.66ghz.com/aion_free_to_play_ed_ncsoft.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505096/normal_5fe45cccc2c2e.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
    • 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_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 5152 bytes
SHA-256: 3efaf3eb208276596766f457bca393c72052db6a01e5552f58e6cfe5fa8896a5
font_01_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 10420 bytes
SHA-256: 58c9a33c1da0158fa576e1857f712c1b5c9d417440c58850a7006337aee61f0d
font_02_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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