Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fee560d521df3f…

MALICIOUS

PDF

161.3 KB Created: 2021-02-15 11:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: efdfb77949d4016632b2287ea2c8b94b SHA-1: a5d64065ae3a268f2156af682dd5112f508bc8ab SHA-256: a2fee560d521df3fc73a672aad54902ee9584ad13bf06985d43ba11538459e8d
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF document contains heuristics indicating it is a lure for a remote support tool, a callback phishing scam, and a password-protected archive. The embedded URL `https://crophysi.ru/strik?utm_term=anti+deep+freeze+v8+download` suggests a lure for downloading software, potentially malicious. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or social engineering attack aimed at tricking the user into downloading and executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crophysi.ru/strik?utm_term=anti+deep+freeze+v8+download PDF link annotation
    • http://rollernefritmassage.xyz/99733100603wvpxh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501660/normal_5fe43c8e8d8e0.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/pJTjggd/describe_the_triple_entente_and_triple_alliance.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/d4MSYQz/dulewubadotuvimiletulik.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/hf8jeif/33305523898.pdfIn PDF document text
    • https://cdn.sqhk.co/joxopejufito/YgfNXic/wivarakadevuso.pdfIn PDF document text
    • https://cdn.sqhk.co/nutanujel/hfThibX/planet_fitness_apple_valley_ri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459059/normal_5fcbd04a0cdd1.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/gF45jh8/awesome_video_live_wallpaper.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/fenatagazise/57216915773.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/38180376366.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/liberty_shoes_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/1709520974.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/darius_guide_runes.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/tv_series_online_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/4_types_of_sentences_worksheets_3rd_grade.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000223b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223B1 5244 bytes
SHA-256: d188dc014b99e18c9abf9dec206635fbdfbcd431c60d22da24720d7c4a914376
font_01_sfnt_off000235bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x235BC 13260 bytes
SHA-256: 369e9dc27e03a9c6ea10727b9cec4be53dc7747492e5ede046fa48d64552b0f5
font_02_sfnt_off00026040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26040 16476 bytes
SHA-256: 76bdf2b63ab8a207a392d25bbfcebe613e589a366d5e5441256b057d9e938673

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