Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07893cd79feeb9c…

MALICIOUS

PDF

80.0 KB Created: 2021-02-26 13:36:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c199694496698414e49f4c51b49aaa81 SHA-1: 659c085a050dc965ddf290e3a8c9d1cfd69315ba SHA-256: b07893cd79feeb9c0730e175deff3cbb719c5d8a8aab449bbe4e461455819c01
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=drawing+on+the+right+side+of+the+brain+upside+down+exercises PDF link annotation
    • https://nopuxexej.weebly.com/uploads/1/3/4/4/134498230/viduvewu-dujew-xedarumobuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424996/normal_5fcd51e4b5ec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5fdba6880bc09.pdfIn PDF document text
    • http://kudezixajuxuni.66ghz.com/durham_college_library_subject_guides.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374374/normal_5fe42a3beb3ee.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/am_i_eligible_for_maternity_allowance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_6022e91ee2707.pdfIn PDF document text
    • https://wovukevaz.weebly.com/uploads/1/3/4/5/134523328/jujuresamo_gilogipedadimen_dadax.pdfIn PDF document text
    • https://zawiwiguxasawum.weebly.com/uploads/1/3/0/7/130739629/dde873b35ea57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_6019587ee72e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_6029e1981a74a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_5fd1d0e2e6197.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/xopixepozigenupaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_60210f622f0f6.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/5309289.pdfIn PDF document text
    • http://penageli.getenjoyment.net/tonufapi.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/how_to_find_the_common_ratio_of_a_geometric_sequence_calculator.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/second_grade_2nd_grade_measurement_worksheets.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/how_much_does_tracfone_data_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saxodanokijaj.atwebpages.com/79602462541.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/telugujimutadal.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_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 5684 bytes
SHA-256: ba46eec8674a7c7c44337858ef7fcb40defc8bde3c833252918c426400d2b82c
font_01_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 10224 bytes
SHA-256: e64d9ca85d6306c685f5ad45e4cc04a25f04efc77cd047ef30050fb2fe4bd999

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