Malicious PDF — malware analysis report

Static analysis result for SHA-256 afaac6e8f42c2802…

MALICIOUS

PDF

75.8 KB Created: 2021-01-09 13:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2c7cc0b93065d0f0bb0c514f32ab3a62 SHA-1: 2b9abd23404c60cd56b18c3b6e5be38af207ebd6 SHA-256: afaac6e8f42c28022a7f5d97aff5aeb51c42ef090ecfc3a6834fe4ef3ca05d5c
272 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its use of a link farm and a redirector to known malicious infrastructure. The document body, though heavily obfuscated, suggests a lure related to medical records or invoices, consistent with phishing or scam attempts. The presence of numerous embedded links to disposable hosting services further supports the malicious intent, likely to distribute further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=highland+hospital+oakland+medical+records In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f9036be69e40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5f88f3a011a54.pdfIn PDF document text
    • https://mamonesobekemi.weebly.com/uploads/1/3/4/3/134320903/395a27482ca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410415/normal_5fa24b770fb0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5fd23cd2d3413.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/22idFhi/ghost_train_race_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/oIieF2B/6449147077.pdfIn PDF document text
    • https://kotuvowomikek.weebly.com/uploads/1/3/4/3/134370123/43aaeb63795d3eb.pdfIn PDF document text
    • https://xizukuzu.weebly.com/uploads/1/3/4/6/134606793/2c4b959b8e831.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421768/normal_5ff6571a69683.pdfIn PDF document text
    • https://ridewavovelomu.weebly.com/uploads/1/3/4/6/134697160/5e10f36106e5.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/6835051.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419002/normal_5fcbb3527b320.pdfIn PDF document text
    • https://noxerurivago.weebly.com/uploads/1/3/4/7/134767941/jigij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472506/normal_5fa67b2bef395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 5512 bytes
SHA-256: fc8e66096d85ff58e58e9716ac2b1d84725a912011ce5fccc4c6afc18f6005c8
font_01_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 10872 bytes
SHA-256: 9069485cb7d6bf17b27ac5e8e32c044df3383dd7d1c76f2e5a5258ace463f868

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