Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabb306c1f813a6e…

MALICIOUS

PDF

72.7 KB Created: 2021-01-09 12:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7831e2f9f19f0ed9b63989e9c127cdce SHA-1: 9a2bccf50bfac97107ed78e6be76eef432483cd6 SHA-256: aabb306c1f813a6e3d650f7a4206f92a0e36129874802f48c4aee3d051f9c5fa
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. Another critical heuristic indicates a PDF link farm, suggesting an attempt to generate traffic or distribute further malicious content. The presence of a callback lure heuristic also points towards phishing or scamming activities. While no scripts were extracted, the overall structure and URL findings strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • 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/123?utm_term=pohl+rec+center+membership In PDF document text
    • https://static.s123-cdn-static.com/uploads/4387589/normal_5ff63a5f7dd4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_5fba369b3e1ed.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/dgcjerd/37616311416.pdfIn PDF document text
    • https://cdn.sqhk.co/sekijebasazi/eXiYSjh/2017_michigan_football_draft_picks.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/hRigCEW/ivi_virtual_pet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5f8a850b01607.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/ZBTIVZR/download_game_fidget_spinner_mod_apk_android_1.pdfIn PDF document text
    • https://memebewaliz.weebly.com/uploads/1/3/0/7/130775997/9396834.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5ff4b375b9f6b.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/JAi9bhc/free_music_download_app_offline_for_iphone.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/47fc43b3-47dd-45b5-aeca-2c792fcf9982/lijasomage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/207a75a3-0410-41f9-adf9-2b044c7a57e0/juvawowepuwolotojasunisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a751b7d9-5205-4f00-9f8b-ef3a56d5b459/42823151903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f55e967-740d-4311-ac7a-5df32988db91/ferexupovelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56aa1b4c-45ce-4a65-accd-57f819cea373/85089924025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5290f570-bebb-47a0-a094-f3c130593aa2/36678723431.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_off0000de5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 5104 bytes
SHA-256: 18d60d63fc68018a24784bde3f9419042c2c47f1c1d39c100f2ebe23158e86bd
font_01_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 11268 bytes
SHA-256: 9e3e40e03960c824206a20e5cc5f1a6a36cdd081fd491d05fa730eda48fe7915

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