Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1091962b028763…

MALICIOUS

PDF

72.8 KB Created: 2021-02-27 06:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: dd477fe86b7c33c9d5b68569bd8097f8 SHA-1: caaf293d4ed8e644363a62203c36924ae6871a75 SHA-256: dd1091962b028763d49a5bd8e64c2e855b8a2afd7d822cb8137b2d1bc36f3912
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URL 'https://pelibifir.ru/award?keyword=ch4%2528g%2529+%252B+2o2%2528g%2529+co2%2528g%2529+%252B+2h2o%2528g%2529+enthalpy+change' is likely part of this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://pelibifir.ru/award?keyword=ch4%2528g%2529+%252B+2o2%2528g%2529+co2%2528g%2529+%252B+2h2o%2528g%2529+enthalpy+change PDF link annotation
    • http://tivulaxovena.22web.org/17667792030.pdfIn PDF document text
    • http://bupatinewesep.66ghz.com/grammar_sheets_for_middle_school.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5fd6718bc2b23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5fe89c039f10f.pdfIn PDF document text
    • http://iqecoportal.ru/new_star_wars_movies_coming_outfe0hp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473632/normal_601aaabc46cf6.pdfIn PDF document text
    • http://kulokozataxat.22web.org/funny_brain_teaser_questions_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495974/normal_5fdf510e858dd.pdfIn PDF document text
    • http://circus.market/508322184451tze2.pdfIn PDF document text
    • http://jajifejeda.22web.org/33739850614.pdfIn PDF document text
    • http://drnextact.xyz/download_wild_blood_apk_mod_offline9t2bg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kudawugijamino.rf.gd/42779734157.pdfIn PDF document text
    • http://potovoz.rf.gd/ranupeganum.pdfIn PDF document text
    • http://faxajipemafeb.epizy.com/vermont_castings_encore_2190_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/baby_got_back_karaoke.pdfIn PDF document text
    • http://fevejalamozek.epizy.com/tasorapajelu.pdfIn PDF document text
    • http://fivamoxopel.epizy.com/apple_bonjour_service_windows_10.pdfIn PDF document text
    • http://zunonaselopa.rf.gd/zirivafu.pdfIn PDF document text
    • http://gajedimigifupet.epizy.com/40771727742.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 5304 bytes
SHA-256: a020223e1b32b3a0b09d30bb77739e18c0895adf6a193751e21755fb982de27f
font_01_sfnt_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 10652 bytes
SHA-256: 560654d82bcf97979cf9056cc7f19fdbe841d04657c4b02957da203d28093aee
font_02_sfnt_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 16152 bytes
SHA-256: 5bb2a7a6380d1dfafb539ecff73d32ebbe261088a673e400f34aca4fbad20734

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