Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad2b3d19b03c8b1…

MALICIOUS

PDF

40.5 KB Created: 2020-11-08 02:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5822e73a226d64c010b17a80b66af79c SHA-1: 18c0e43319008647aa2e9996fab2c7e2ffedbe7e SHA-256: 7ad2b3d19b03c8b1dca8649f69a92e9e69d91f3f34d5a474c66fdf7f0df0023a
146 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, identified as a link farm, with a primary URL pointing to a suspicious domain. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites, possibly disguised as search results.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/aws?keyword=walgreens+atwells+ave+providence+ri PDF link annotation
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/7526c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_5fa3adea07296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422163/normal_5fa1b79c56c3b.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/2965615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390661/normal_5fa725fa451e2.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/6762618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_5f8c32dc9d1f1.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/laresisif_kigadebokenub_bajutinerid.pdfIn PDF document text
    • https://sogenaluvejor.weebly.com/uploads/1/3/4/3/134328850/4bdd16bf868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_5f9eac9676943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_5f97b62cad88f.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/8740011.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://sevuropigo.files.wordpress.com/2020/11/45621698555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfae5cdb-a784-4b35-bf1c-500c2c85c77c/likabus.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_off00004fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE6 5196 bytes
SHA-256: 64785371437e034f694b4d24e911719836e6defb2122fd1b9a7f103795a1f0d4
font_01_sfnt_off000061ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AE 10396 bytes
SHA-256: d1dd97818524503022ea1ec43a39e47bb55d0a724853cc32adc32db133875087
font_02_sfnt_off00008547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8547 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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