Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d20adc7e03fe02…

MALICIOUS

PDF

75.1 KB Created: 2021-04-04 10:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 840e44c593b73d31960481263d63b1e3 SHA-1: 98bd8dfde31c8e8b74bf556763737b280f51f766 SHA-256: 29d20adc7e03fe023465fbf26c8f693d0985adf4c442ec56081272aabe94eff3
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDFs hosted on various domains, many of which appear to be disposable. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malware. The ClamAV detection and ML classifier further support the malicious nature of the file. While no scripts were extracted, the critical heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' suggests the links are intended to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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://yafferge.ru/wix?keyword=january+2009+physics+regents+answers In PDF document text
    • http://helps-lnstagramcopyrights-about.com/buku_sejarah_dinasti_abbasiyahnmepy.pdfIn PDF document text
    • https://divamokavagi.weebly.com/uploads/1/3/4/8/134871471/duxasutafunoweg_tanatave.pdfIn PDF document text
    • http://whitetwo.space/29293654469644z2.pdfIn PDF document text
    • http://kebenoda.scienceontheweb.net/32540234289.pdfIn PDF document text
    • https://waxosutuj.weebly.com/uploads/1/3/1/4/131437699/3060781.pdfIn PDF document text
    • https://sumesomorap.weebly.com/uploads/1/3/0/7/130738681/6ab2269b564ad.pdfIn PDF document text
    • http://xomutukegadoj.mypressonline.com/arcmap_10._5_tutorial.pdfIn PDF document text
    • http://usesalon.xyz/455200860565cvf4.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/49395146712.pdfIn PDF document text
    • https://napifilimikap.weebly.com/uploads/1/3/1/6/131606974/mogaxepipa_zamulimodof_wusikonir_bedivekoga.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/sql_scenario_based_interview_questions.pdfIn PDF document text
    • http://memimusisat.getenjoyment.net/how_many_books_are_in_the_wimpy_kid_series.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_d859c3407dfe4e8c9d7ca46f538610f4.pdf?index=trueIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_a35f71dd1f1247a68fee683da5062df5.pdf?index=trueIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_7064f87fe38e478e95e86f6d55a17224.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_c4c22934eaf44070ad76894f23871ca7.pdf?index=trueIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_cd72c245e2ca4818986d1fdbba001d51.pdf?index=trueIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_cf282c4448194210bb86ea7ab7a6bb24.pdf?index=trueIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_9b13d6db7e60479bb6464c812dfded8a.pdf?index=trueIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_0b4f2bf6515d4898b2c0576a55bcbbbc.pdf?index=trueIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_18e6102837af4525a1f04cca4b03ff08.pdf?index=trueIn 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_off0000e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 5776 bytes
SHA-256: f00c7d3585eb57970e44ae5dafa94aeebc2914a354808b7eb300d61c27b99098
font_01_sfnt_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 10976 bytes
SHA-256: 6de85881b537985a0719a7545aa5d8e80fc2e2b3ae45a9929163fc506b0f0ec5

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