Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f78828b634127ae…

MALICIOUS

PDF

70.3 KB Created: 2020-12-17 06:38:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 819dd876b52521ccce9466a4bf1313a0 SHA-1: ebef1c07b198f61dbbf8dc8a2b687409fb1b0f59 SHA-256: 6f78828b634127ae9503ca7bc2988ad62c3bf51b015304b46d1e71b7598b5261
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The presence of a large number of external PDF links suggests a link farm intended to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/aws?utm_term=tencel+sheets+pilling In PDF document text
    • https://dujomujur.weebly.com/uploads/1/3/4/8/134883281/767078.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451742/normal_5fcbff0f0f43e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_5f96173c7fca1.pdfIn PDF document text
    • https://nufodovepitad.weebly.com/uploads/1/3/4/7/134718778/a7403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_5f96d477295b3.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/81f7871b-ee62-46c6-9413-4252d6069af1/nutogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76976a0-b588-4744-8d83-d4cb154eea41/valor_absoluto_y_valor_relativo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a13c66-8a4d-4d13-8832-8071a3acda22/umbrella_academy_season_2_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6888c7d-e3f0-4856-8d25-639ab88acdf2/e1_and_e2_reactions_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81fb4c9d-c923-499c-b795-db5c2ab82c69/kapod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e859b9-7ab8-4496-85be-2a6462458ef8/fenajixorilaxapiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d738430f-3668-4c5a-8ce7-1297ca3cb4a9/pemaxaduxegor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a3701e-2676-4e7c-9237-217a1ba1b2a6/kujugakilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6141fc37-4178-41da-9792-228653322110/rofojuxefekikewofe.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_off0000d6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 4840 bytes
SHA-256: 229261e4fbefea1251a504c58311b59ec1979057d9022728bdd60c29c5f8c341
font_01_sfnt_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 11124 bytes
SHA-256: 9acb901174ea564cd345292c1c374568cee45f55c8acf7cff0205e97eb252977

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