Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d95e98621bdae8…

MALICIOUS

PDF

88.4 KB Created: 2021-05-21 12:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fed2b3f839eb22c5660d165b242f21d1 SHA-1: 93889e587664d46ed4271ed51a087384f3fc07af SHA-256: d7d95e98621bdae89eb00ad531e74dbd89bfca0a79f406abb469ed0c5faa13d9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://nipisod.ru/strik?utm_term=poesia+despedida+del+colegio+primaria PDF link annotation
    • https://gajuleli.weebly.com/uploads/1/3/1/8/131871701/392124.pdfIn PDF document text
    • https://roxewakedenal.weebly.com/uploads/1/3/1/4/131483042/1958574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444110/normal_5fd67a497fd71.pdfIn PDF document text
    • https://zelunewu.weebly.com/uploads/1/3/4/8/134879867/mizaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_60184b271133a.pdfIn PDF document text
    • https://xetodalu.weebly.com/uploads/1/3/4/4/134458353/e2f2dfbec08c067.pdfIn PDF document text
    • https://wabirigiraziw.weebly.com/uploads/1/3/6/0/136017191/8700017.pdfIn PDF document text
    • https://vilewojux.weebly.com/uploads/1/3/0/8/130874250/wovesaw.pdfIn PDF document text
    • https://tunibedexorole.weebly.com/uploads/1/3/5/3/135350281/4804505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460709/normal_6060b4b7becfa.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/66993da7-3114-4a05-a9fc-482247be97b0/tegazedafavafifaxigala.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/atomic_physics_christopher_j._foot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f21e5187-d48d-4324-ab2f-927b366293c6/acer_aspire_e15_specs_i5_8th_gen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd5bda9a-ff99-43b3-ae85-ed4bd8108af7/2007_jeep_grand_cherokee_transmission_shifting_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/scratch_2_for_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/jibododowuxebamuselubivat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/686560a9-5356-45ba-b8a2-b7dcccc64ffd/14139480132.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/how_to_reset_breville_coffee_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f087d211-200b-431b-a9cd-a79690788d60/who_broke_the_treaty_of_hudaibiya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ebee907-0cf3-4740-981a-1a8fd4cbfd19/84185177376.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/9658686470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82fff336-5a3b-4878-a74a-daadeef75341/how_to_set_the_hands_on_a_casio_wr20bar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d0e6a6-41db-494e-afe8-99a1acf7ce68/edexcel_igcse_chemistry_pearson_student_book_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/910c0dd8-df3d-4c92-8340-3aa6740fa497/22054122969.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 5392 bytes
SHA-256: ca5d9a05ed5eb18034afa40f1441c4f7d640e0056aaa79aae1d6b1a989b4d4b5
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 3352 bytes
SHA-256: 87d16cedaafbe68f4d609dcd71640022e3f38f87deff3f43a7b6fc02ac446d7e
font_02_sfnt_off000114dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 12100 bytes
SHA-256: b6c20726701f518a394ffbac3ba0b6953b435fbb4a5f51cce3883b1b70a4ffb4
font_03_sfnt_off00013c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C84 16096 bytes
SHA-256: b3966cf2c6ffdff3cbf46f1e9fde5b7adb6d08a09d239bea052f7f498201c009

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