Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1550b804fcd3844…

MALICIOUS

PDF

82.7 KB Created: 2020-12-03 12:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a1e546d012af0601d483330292b3c56d SHA-1: 18e6056ee3b1535dc8a05e653edb396370bb0603 SHA-256: d1550b804fcd384433e4bfb5f1083e34eb632b3b5f7ee75b535e6e5c5ced73e8
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it functions as a phishing or redirector lure. It contains a large number of embedded links, many pointing to disposable hosting, designed to direct users to potentially malicious sites. The presence of a redirector link and the overall structure strongly suggest an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • 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=maroon+5+makes+me+wonder In PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_5fc40d2c52ae3.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/7111836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456378/normal_5fbc851684a53.pdfIn PDF document text
    • https://zogetesiwuxiwa.weebly.com/uploads/1/3/4/4/134487963/dimejoruganolon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_5fab8efae5819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461751/normal_5fa2191d6fc45.pdfIn PDF document text
    • https://wowuleraregode.weebly.com/uploads/1/3/4/6/134690179/2295002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_5fbbedf221bd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5f9dc0abbc787.pdfIn PDF document text
    • https://zaxiradijewebox.weebly.com/uploads/1/3/4/8/134889682/c6d4a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448992/normal_5fa9c1a1e9ead.pdfIn PDF document text
    • https://xezagepu.weebly.com/uploads/1/3/4/9/134901129/6986305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502563/normal_5fb2c256da35a.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/3cdae670-2577-4935-b27e-a1d37b522a78/5e_elf_trance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3915d18d-6770-4b64-8550-a476e7536c4f/achyutam_keshavam_ringtone_free_down.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_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 5224 bytes
SHA-256: d635c190fde2de82189214406526f35e547d28305d0b867293e8d4db07e8c9b5
font_01_sfnt_off00010e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E16 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000116a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A3 11852 bytes
SHA-256: e987ada9295ec8732804cd9e6e8b6bf116cb8622ff52d208bef01d7335230747