Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca7dfa54078d17d…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 06:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 11bb43a29f9b92baa6bab390577eaabb SHA-1: 8cbe091b2891177c90d7e878503f55caaeb45b58 SHA-256: dca7dfa54078d17dbfaddcb2256cda8933b2a7d1e506781432702432dcd69428
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, with a critical heuristic identifying it as a PDF link farm. One of the embedded URLs, https://mezovuduw.ru/wix?keyword=csr+racing+mod+apk+obb, is a primary indicator of compromise. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests a phishing or SEO poisoning attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/wix?keyword=csr+racing+mod+apk+obb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385009/normal_60500dc97e2a3.pdfIn PDF document text
    • https://zekufizow.weebly.com/uploads/1/3/0/7/130775694/segaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403684/normal_600e3a5dd189f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491673/normal_604d633427339.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450438/normal_5fee19ecd07fd.pdfIn PDF document text
    • https://tewavifoma.weebly.com/uploads/1/3/4/4/134482239/rafifivolibusarezub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424997/normal_5ffbc85c0eded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_6052e9901976f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448096/normal_603fa72a4d517.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497638/normal_5ff1e5498c21b.pdfIn PDF document text
    • https://joponavo.weebly.com/uploads/1/3/4/2/134234964/3a82c55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/577f49cc-531e-4f97-b492-cef534fd4dd3/88286349646.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/epileptic_status_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/nadujuwizogej.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/45714185435.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/bolt_length_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/bleacher_report_nba_houston_rockets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb9e819-bca7-456c-aa72-4c1709c051f8/73333797056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b750dda7-9b5c-4c63-897b-84f1e8df56e1/asus_m2a-vm_hdmi_lan_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/15344981380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5b1b48-9705-42c8-bbff-4afdb383cfd0/who_is_in_erik_eriksons_fifth_stage_of_development_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/picsart_premium_apk_full_unlocked.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/url_video_er_iphone.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_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 5468 bytes
SHA-256: 047563264fc46ec726029d9e1f31aaad018534238dac5e52a28db54dd53010fc
font_01_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 10876 bytes
SHA-256: c2db768e5d1f9569028bf0a3f65259fc551355f303f774b63448ccec67275984

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