Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b772432f0458458…

MALICIOUS

PDF

40.5 KB Created: 2020-11-03 18:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3c5b4d463cdd51163ad2e52555e356b9 SHA-1: 8251e8d2dc10c6939c8f7ca022787e148a6540aa SHA-256: 7b772432f04584581a9e054614840fe8baf3123b8449967612f15a63fe64245f
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The SE_CALLBACK_LURE heuristic suggests a phishing or scam pretext, aiming to trick the user into clicking the link. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 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://cctraff.ru/strik?keyword=veridian+thermometer+manual+08-362 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_5f994beb1e9c6.pdfIn PDF document text
    • https://deperomider.weebly.com/uploads/1/3/4/3/134344929/zesexib.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/efe324d83e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_5f8aa466c0ca7.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/majajisanolaxokime.pdfIn PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/7577825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f8f77d10c4f2.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/4798140.pdfIn PDF document text
    • https://jugidemavewug.weebly.com/uploads/1/3/4/2/134265355/netorum.pdfIn PDF document text
    • https://kixatefibav.weebly.com/uploads/1/3/0/7/130776592/4425397.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/d5878aef-0e01-4967-bbb7-e472d2be4398/zoxuxemuxumupijoxadebizus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/909f65db-4921-4a14-bee1-3733fb0e47e9/a_guide_to_village_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/273cb46b-1544-41c2-a962-4c47b9e771cd/wetenepogemejexebawubev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54cd5b58-fd2e-44d8-8d3a-b86a4e3c84e0/tinofasam.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/jejafemugepijusumarup.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE2 5672 bytes
SHA-256: fe9438189f1e4ee74ebd6aa2c88fc28a7bfbd34bd2a7af0b9d7de849730584df
font_01_sfnt_off00007008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7008 10860 bytes
SHA-256: f8e5470a9b3927b33705346557946b32524833d257091833c53c43f9389373e2

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