Malicious PDF — malware analysis report

Static analysis result for SHA-256 a191eef6663cc7df…

MALICIOUS

PDF

75.0 KB Created: 2020-11-10 10:11:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 04d7f3ca187dc69d187eca24849d91c2 SHA-1: 4c02ab6107105838d764eab10535a65793f3f575 SHA-256: a191eef6663cc7dfa7d3ec6eb3952eb7dd86c0e14b467ec7d136f1c3a69cd0bf
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to a driver download executable. It also exhibits characteristics of a link farm, with numerous external PDF links, suggesting a broader campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/123?keyword=broadcom+ush+swipe+sensor+driver.exe+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_5f9262b59323f.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/sujirabejumito.pdfIn PDF document text
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/5079628.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://s3.amazonaws.com/sefipa/dezabaluvaxabep.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/55216615494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc63c57-3421-4e38-a149-3215fce8488f/67716807926.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/hearthstone_best_dragon_deck_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/mewiluluberizupa.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/cellulitis_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/infeccion_por_blastocystis_hominis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c30b3b2-e9cb-40f9-8646-428c8700af82/brawlhalla_val_combos.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/mr_allen_math.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/xudutiwoxutetamupasot.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01F 5416 bytes
SHA-256: 2d7ebe5a5215b3eab9425cb8a02cb75021aef013b64880438c3be779f42a7127
font_01_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000eaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF9 11048 bytes
SHA-256: cb4ef2e07d54efbd6be080a33a2df72b97001c7dfab0c10186653302db552008
font_03_sfnt_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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