Malicious PDF — malware analysis report

Static analysis result for SHA-256 207d903df765a4b3…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 07:01:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a1d4b77a2b100388757b489a517699a1 SHA-1: 0db503cf45d4b55a01df2f530c6d068de8b53349 SHA-256: 207d903df765a4b393ef9a7e0a4e46fc25e346014e609178743bbd68cfd86b22
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary external URL points to a site offering a dictionary search, suggesting a lure for SEO spam or phishing. ClamAV detection and ML classification further support its malicious nature. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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=dictionary+english+spanish+cambridge+pdf PDF link annotation
    • https://setowunujabid.weebly.com/uploads/1/3/4/0/134095848/wipuzezoto.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/xofilipiv.pdfIn PDF document text
    • https://bowilidorufe.weebly.com/uploads/1/3/4/6/134603038/jememugezibo.pdfIn PDF document text
    • http://bimelar.22web.org/dojegegexapil.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/ghifFih/6892669568.pdfIn PDF document text
    • http://mutodute.22web.org/79278587183.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/fUGhiZB/wenoweliwide.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/hbVVige/9180421745.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jevelel/31776210434.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/fifitumaki.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/nonigajil.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/65806828756.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/candle_magic_low_flame_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/dfa_passport_application_form_2018_minor.pdfIn PDF document text
    • http://najazelep.rf.gd/73211422884.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/monabilul.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/habitat_for_humanity_restore_donation_valuation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/the_boy_is_mine_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/nosugot.pdfIn PDF document text
    • http://zanobunu.epizy.com/ebook_reader_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/dd_books_5e_amazon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 5596 bytes
SHA-256: 515a59947f5ebf8be1f36a8b7fed1d39d98a3837682c00c53aee94ff8446d6b7
font_01_sfnt_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 11776 bytes
SHA-256: fd5d623c42ea843c6d476adac24b1eb206a62474b9d68600005cad9cd2273282
font_02_sfnt_off00012053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12053 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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