Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f6eedca8e917a8…

MALICIOUS

PDF

68.2 KB Created: 2020-11-25 21:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5dd0252d0f2a256097488c1a9987388 SHA-1: 1e16f30de0a395a94450f0d8069379a59994237f SHA-256: c9f6eedca8e917a864ce6d3303ab73641c11d39a0a75940bf850c3de54f87f8f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=cook+middle+school+phone+number
    • https://gedamalemomomig.weebly.com/uploads/1/3/4/5/134504316/jegujamegew-bumexi.pdf
    • https://ribafiligizeki.weebly.com/uploads/1/3/1/4/131438260/kerepos_dazafisoxesafi.pdf
    • https://jajijonag.weebly.com/uploads/1/3/4/7/134762104/raganex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kiwopusafize/free_gift_coupon_template_word.pdf
    • https://s3.amazonaws.com/pusori/frontline_commando_2_mod_apk_revdl.pdf
    • https://s3.amazonaws.com/sitok/design_patterns_explained_alan_shalloway.pdf
    • https://s3.amazonaws.com/nazekisigiduz/benelli_armi_spa_email.pdf
    • https://s3.amazonaws.com/runuzitexokol/sobisabuv.pdf
    • https://s3.amazonaws.com/nitajosasa/valomejazopopawobamomig.pdf
    • https://s3.amazonaws.com/litunux/hank_aaron_autographed_jersey.pdf
    • https://s3.amazonaws.com/rupatojuko/45253596544.pdf
    • https://s3.amazonaws.com/gumagabu/25403283802.pdf
    • https://s3.amazonaws.com/susopuzupure/38862095065.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c023.bin
fe87167cf09bffb9b6403d974cfb3f2d50e9b7c95434b1a7d4c792ef59148b44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC023 5132 bytes
font_01_sfnt_off0000d161.bin
0ae00e7697c352af2de5c5c313346d182814df8979a5c3a8aa220fce22099e9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD161 11172 bytes
font_02_sfnt_off0000f628.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 4324 bytes

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