Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4167451d800f85…

MALICIOUS

PDF

78.9 KB Created: 2021-03-25 01:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cb0b790d7b9bb934b6934391160b6f35 SHA-1: d9883929dd1e029ba3d4f053e7259702f7f2ff6f SHA-256: 7f4167451d800f8539bd657609766dffddaf6d5dead6d24bbe38a420c1948944
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://leonvi.ru/award?keyword=glucolisis+anaerobica+y+aerobica+pdf PDF link annotation
    • http://galabogenezoso.getenjoyment.net/matevu.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/atmel_studio_7_tutorial_espaol.pdfIn PDF document text
    • http://bajoreto.sportsontheweb.net/what_happened_to_wu_tang_on_hulu.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/lodufiraf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muwuvago.atwebpages.com/very_hungry_caterpillar_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3789c255-b1d0-4153-80a0-cba464056f42/wutikejajujumomiv.pdfIn PDF document text
    • https://aaa8450b-5959-4376-bf95-5e5e4b45aab3.filesusr.com/ugd/bcfc74_50a1c7e540a642dba4929883b297074a.pdf?index=trueIn PDF document text
    • http://sinusisokopex.atwebpages.com/how_to_make_a_rose_flower_arrangement_in_a_vase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a4eab5-f909-401a-898e-e5685f90d538/grounding_techniques_for_anxiety_therapist_aid.pdfIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_64dd206c7f314e5da3dfe83afad2cc2a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ffc4c48-7dbe-4ae0-82f6-aa18d0d5dbbb/zekijufixababigul.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_a4529cbb89a845d2b7b0acfbebe2b44a.pdf?index=trueIn PDF document text
    • http://sajulugebimisu.myartsonline.com/12675751514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d50a03ff-7f52-4e45-8c16-b483275a5c84/98645723041.pdfIn PDF document text
    • https://62bfe9e3-d01a-456c-9d14-3ac71290fd99.filesusr.com/ugd/cfe640_1b106c4368af45258a1c0dea216a068a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c55fe437-5c7d-4e8a-9df4-d0d1d2d79fb2/chemical_properties_of_palm_oil.pdfIn PDF document text
    • http://disoluje.myartsonline.com/4486795510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef751c96-5b54-4de7-8ab3-51cc312ea725/ge_true_temp_gas_oven_self_cleaning_instructions.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_c4ef5e25ec7543db9e318f426044ee0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52858aab-4138-4461-a599-a7d8c0c0626f/sony_bravia_klv-32w622g_32_inch_led_hd-ready_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff46c71c-7b55-4992-8083-ef0432334aba/12395805661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ac4ec2-ba80-4079-a7c2-6af370b2978d/black_and_tan_dachshund_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a7560a9-bb86-4e9b-90cf-9cfc2b2b1688/how_to_use_qualitative_methods_in_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34a3228-346c-408e-b8c5-a8c68a953d55/kozuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c30436c1-2618-4353-bb7a-784a3eaaa0ad/guvojakowijifopatoniju.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_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 5424 bytes
SHA-256: 728890fe3435c6e73e6ca24d7978c6235ea318ff6d0daf38cd3bac30d2284138
font_01_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 12104 bytes
SHA-256: 8afde8c8015fb23a76105e46fd2e44d0d4a267a2735f732a739c95d59fd3afae