Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbaa6de38c3c6e7…

MALICIOUS

PDF

67.1 KB Created: 2020-12-24 12:38:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a95e2cbe6ce378066e9f073fee915341 SHA-1: f6dc30f80d8a89c397dab19b1f669290d478821a SHA-256: dbbaa6de38c3c6e7ac7a541eb64631a3913f3c0aeb29cd66ae4ecfb5c1fa1a16
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to redirector infrastructure and a link farm, indicating a malicious intent to direct users to potentially harmful sites. The ML classifier and ClamAV detection strongly support this assessment. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffking.ru/aws?utm_term=letter+envelope+template+illustrator In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5fdc5b5f586d5.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/fopiwoxu.pdfIn PDF document text
    • https://bikopevi.weebly.com/uploads/1/3/4/3/134391393/muses.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473916/normal_5fe2c05a92a11.pdfIn PDF document text
    • https://xajupodesuze.weebly.com/uploads/1/3/1/3/131380723/sosava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5fc139c30de70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_5faf35d72a3d6.pdfIn PDF document text
    • https://rusopuse.weebly.com/uploads/1/3/4/4/134498446/2075e320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5fa2fc5189e08.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/e357e6cb-edea-40de-8930-72ad6d6666fe/abbvie_immunology_scholarship_winners_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97e0bdc-e8b6-471c-9d92-f14796e97e6e/blai5_atlas_ntslink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd612a3-b560-4c2f-8412-6d3f92b61fac/dexetiwirananize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bc437a7-ab0d-4fa1-83f1-fa50a9e7b652/29088102475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ec865d-4036-4876-9931-cb7548847d5a/wevisalogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/540fa237-fd8e-42e8-810e-692969590fb9/accu_chek_aviva_meter_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/089b7d05-a4af-46ea-943f-b1f72f6d9c45/orwell_ignorance_is_strength_episode.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_off0000ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 4964 bytes
SHA-256: fa6d0e4b0d52702ba6e2cfd5a2582bc44b880c21ff0bc20e78f08213f1421a9c
font_01_sfnt_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 9948 bytes
SHA-256: acad5ea57effbc05ce4dd1c3eef2c8da5a125f540bc975daff6a2db154bd4b91

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