Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47fd99d3fa279a2…

MALICIOUS

PDF

74.4 KB Created: 2021-04-01 05:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3faa90b8cf50af3521517679968cdee9 SHA-1: e862d271102252a9fad095357a99a19655eb2991 SHA-256: a47fd99d3fa279a2a00a0c4a742f8d724c490951379bb7fa3bfc3e058efd3c21
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly suggest malicious intent, specifically a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://jottigo.ru/aws?utm_term=should+i+read+the+tibetan+book+of+the+dead PDF link annotation
    • http://sollabs.xyz/zilatovepa3o7l5.pdfIn PDF document text
    • http://disconto50.pro/89287406080vw5bd.pdfIn PDF document text
    • http://hookup756.fun/vilujekejolofajo231z9.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/fOYhdgh/jomere.pdfIn PDF document text
    • https://tubekari.weebly.com/uploads/1/3/1/6/131636965/3718dcf02bcf6c8.pdfIn PDF document text
    • https://gugamuwapubadek.weebly.com/uploads/1/3/0/7/130740318/doxirefu-bugiletu.pdfIn PDF document text
    • https://zitenimed.weebly.com/uploads/1/3/1/3/131383388/6628418.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://bavefazetujew.weebly.com/uploads/1/3/1/4/131406687/wafisogabu-nejetogiv.pdfIn PDF document text
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/badulogaletimewu.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/gexibepotar_selaxuxotokuf.pdfIn PDF document text
    • https://dinadexoliba.weebly.com/uploads/1/3/6/0/136091941/6bbbf1e38.pdfIn PDF document text
    • http://koreanluxe.com/scrabble_word_list_2020nybh3.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/fhaT1xU/source_code_editor_ide.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/82128b92-b071-414e-9bfa-3a977a96cda5/wuzubumedaxazoxaruboba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e5100ad-a098-4f74-bb1d-79cea23bb501/huffy_beach_cruiser_accessories.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_7d7de55b805c4dcda0a1c9dc239c4122.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f20e3f10-a816-4cbb-b455-f3f03a187800/estructura_economica_del_modo_de_produccion_socialista.pdfIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_5ee1688044c14808995465e67b408060.pdf?index=trueIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_f723fff28a8946d39bcd24320fa35d1c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a526e88d-ff40-4f27-8378-bdc7d3695cb0/is_the_face_on_the_milk_carton_a_true_story.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_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 5124 bytes
SHA-256: 55c419c1ac71d539883f6badbfea3a3a949c60b34603318aa7c796a3f85c8565
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 10124 bytes
SHA-256: 270da72ae3b5455025db47110699f6205c91ff968e55ddfac511228a524c0b3d