Malicious PDF — malware analysis report

Static analysis result for SHA-256 79006d9a2edfcd9d…

MALICIOUS

PDF

73.0 KB Created: 2020-12-18 03:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8a44f8c13904ab854eed698e8c77056b SHA-1: bfcf0557cbfa32de8848d11b6d8656fc4968ecdd SHA-256: 79006d9a2edfcd9d9f547fc8dbbaf5ee151a8e18b9855362def2ce900d1944be
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external PDF links suggests a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffmen.ru/123?utm_term=into+the+magic+shop+audiobook In PDF document text
    • https://static.s123-cdn-static.com/uploads/4391621/normal_5fcc8f37f0c7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_5faac58c28301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f87d632c65f5.pdfIn PDF document text
    • https://rubazepenomul.weebly.com/uploads/1/3/4/3/134324915/pezizijakaxadarof.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/tanal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461498/normal_5fc11005b1f46.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
    • https://s3.amazonaws.com/legipalofi/novomu.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/maramal_skyrim_location.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27dae5bcb0228a28c7d06/t/5fc70ac03ac9c763f4ce2389/1606879937433/60691017075.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/baal_veer_1111_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb99b2f6-71da-4f81-8751-42672e4c7914/65817157186.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0365dae50a0145882c73/1606222694709/mobipamerarikubumijop.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/wugavonixededi.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/86208726457.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D6 5380 bytes
SHA-256: 78ce449eb09652e5c1d5fb947413d7fb77d179b1f5bba74f29c13eb10578ab29
font_01_sfnt_off0000e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 10672 bytes
SHA-256: 0bba809ffae37a4c99192960b3a7a74d547c011feb696db4acf989da98d8cfd1
font_02_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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