Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a7721e8dd8e031…

MALICIOUS

PDF

77.6 KB Created: 2021-05-27 18:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e214156c9b8098f9da7bffb945a6f51d SHA-1: d5e540cca40b6dcebbd5a5b48a585b2b1a6ac5f9 SHA-256: 36a7721e8dd8e031544886d2575462a369fa338822a597ab22f3b5ee065fa106
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm. The primary heuristic indicates this is a technique to manipulate search engine results or to host a collection of potentially malicious documents. While no specific script was found, the structure and numerous external URLs suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://cdn-cms.f-static.net/uploads/4370072/normal_604cfcf251ad5.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4367273/normal_5fca868e1022f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_600c8ca66f8d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427793/normal_5fcd9780371fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_60660659e663f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_5fd6ac2897049.pdfIn PDF document text
    • https://vimugowome.weebly.com/uploads/1/3/4/3/134323071/8b8666634537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448137/normal_600cfaf6ab0b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_60280db4cb36d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421354/normal_6026e09fc9b49.pdfIn PDF document text
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/cf442b9916d7101.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
    • http://feedproxy.google.com/~r/wb/ENAH/~3/o_fyKxYoRT8/wb?keyword=marriage%20counseling%20questions%20for%20engaged%20couplesPDF link annotation
    • https://uploads.strikinglycdn.com/files/439eb3fd-988a-4a91-b419-bea2cd76fcc3/42010483026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc058f93-337d-474c-b829-0039e5c74afb/download_game_kamen_rider_zi_o_flash_belt_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7bdfea7-b668-4dd6-8ae3-b2c33321f540/32195441057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23dd787a-5d09-4ade-8db9-5450d0b75a07/the_secret_life_of_pets_2_cotton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f80844-8a81-434a-872f-2863be73b8cc/jewujivivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdba29bf-64bc-46c9-b501-3867badcc51b/irobot_roomba_i4_4150_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a08b6da-d634-4184-89bd-55562694ac14/722894296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed74a779-1cb0-44af-8244-d51854b6d486/sazofo.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_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 5336 bytes
SHA-256: a022a6e34b54ffc3b16613494afa9d6c43cbecfdd3279d5c9fbb1fdd48aba90c
font_01_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 10440 bytes
SHA-256: da6b958dc9d9f3fffa76368bfb248b28dbd855bf499d52381195e2b78daaffb6
font_02_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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