Malicious PDF — malware analysis report

Static analysis result for SHA-256 418c1722be8e83a8…

MALICIOUS

PDF

116.2 KB Created: 2021-04-02 07:39:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 936ba74032737b9f1da54966edd463c9 SHA-1: 98fdabd9b7b6f0c83d0ea515084111b1dfbf8484 SHA-256: 418c1722be8e83a8f700da19604b7785a562a360c7f4e985774e54b1a94c4fc7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URLs pointing to other PDFs hosted on various domains, some of which are disposable. This technique is often used for SEO manipulation or to distribute phishing content. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a larger distribution chain, potentially leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/award?keyword=international+dependency+theory+pdf PDF link annotation
    • http://sawemawe.mywebcommunity.org/haryana_apartment_ownership_act_1983.pdfIn PDF document text
    • https://cdn.sqhk.co/lomokubaf/highjgm/50693844635.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366018/normal_5fee416f68c79.pdfIn PDF document text
    • http://badoxik.scienceontheweb.net/union_budget_2020_speech.pdfIn PDF document text
    • https://cdn.sqhk.co/fazituku/heu70Fq/download_cat_run_simulator_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461767/normal_600c89bdf2913.pdfIn PDF document text
    • http://vevaroda.scienceontheweb.net/41397574519.pdfIn PDF document text
    • https://cdn.sqhk.co/tenotitur/rzoPfid/el_significado_de_buzzer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446400/normal_5ff7b8cbe0cb1.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/i_pace_max_charge_speed.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449789/normal_60075bf7b84fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477877/normal_6054102f5994b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_6037dea4015ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_84c3b501d3da4b69b813b98b5a71ca93.pdf?index=trueIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_d8311fbe99f34c8d9c7beb2d8fe78db6.pdf?index=trueIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_582cf6b0b50a47148134459e166cd13f.pdf?index=trueIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_b17121ab79ea4aec9a61ed189ad7ce88.pdf?index=trueIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/oxidation_state_of_hg_in_hgcl2.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_6a9890e473f6405680c04aa95a624ed6.pdf?index=trueIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_b62ad191106b4c5c8c0222209855f3cf.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_0f3ede1cd715405e86015ec933e418fb.pdf?index=trueIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_075ebf270cf146f7ae44462421fbf646.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001723f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1723F 5104 bytes
SHA-256: 0e8e9a4f5b9e3e1f7ef16f284cc2ab83d1c21e240e558d790060791de11baff5
font_01_sfnt_off0001839f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1839F 13644 bytes
SHA-256: 85600ca56120e97a3e471fbb55907ec5bef6181400e3d2c494059ee4fa8441e2
font_02_sfnt_off0001aeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEEA 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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