Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef5c7d98d5e3efa…

MALICIOUS

PDF

69.2 KB Created: 2020-12-05 11:05:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9e8d45bd52225e1b8facd0fce9a4dae4 SHA-1: e0cc271003de98dc534458365785a17ada3b6657 SHA-256: 4ef5c7d98d5e3efafb080634dd1bea671debfd3cf2039dde89ff3748cb201ff1
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a large link farm. The presence of a 'download button' lure further supports a phishing or malware delivery attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it is designed to redirect users to malicious sites, potentially for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://ggtraff.ru/aws?utm_term=android+lollipop+root+apk In PDF document text
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/a9a01d13bfeac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476418/normal_5fc1491372baa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5fa1a2d577406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_5f89a2a6aae66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5f89cbfd99b31.pdfIn PDF document text
    • https://bimebupeku.weebly.com/uploads/1/3/4/7/134715010/vafemexepoguxo.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/gixawetopoli/68519744848.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/saxon_math_fifth_grade.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0baa35687f52b6b804624/t/5fc35d3f3c02f22b9d77fc57/1606638914620/4461000050.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/32727314095.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e0f3f7cf8c75402ad020/t/5fc1f3323c02f22b9d52ee7c/1606546232871/21777464340.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/java_file_from_s3_bucket.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/97629069292.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/55261934096.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc53ca02e34347c7060c180/t/5fc9adab2ae1264a038f111d/1607052716126/sputnik_movie_2020_cast.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc101f96609fd0ee791e489/t/5fc3684b173fb5383b0eca66/1606641742689/donenewuturojibadonod.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/shadowrun_returns_android_apk.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_off0000d1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C7 4828 bytes
SHA-256: ba60fb4370243effbd5540cdb2c71cfe8165921e56f05fb30ec4e9f27f942820
font_01_sfnt_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 10988 bytes
SHA-256: 958801a114ea0dfbd68dc591a7a0af9983bfc02f5925ef5cd5847aff0d7197ba

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