Malicious PDF — malware analysis report

Static analysis result for SHA-256 4051979f8755ddfc…

MALICIOUS

PDF

87.4 KB Created: 2021-02-28 10:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: ac5d1b24183eb9e11bc42e4c185a6163 SHA-1: 364be2e66b4e92c1ebd99b4a218dcc6a6d1b9dce SHA-256: 4051979f8755ddfc823fd99b81c3f3504b9808225f157f4d6035a42d31a10263
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics indicate a high likelihood of malicious content within the PDF structure, potentially exploiting vulnerabilities or redirecting users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://bologen.ru/strik?utm_term=natures+purest+cot+mattress PDF link annotation
    • http://lozelenirulotu.22web.org/the_hunger_games_2012_full_movie_free_download_in_hindi_480p.pdfIn PDF document text
    • http://in-arenas.com/6342116005dsbpp.pdfIn PDF document text
    • http://hookup668.site/78895046350uni4x.pdfIn PDF document text
    • http://puveputado.sportsontheweb.net/88638288596.pdfIn PDF document text
    • http://mijuxub.66ghz.com/ductal_carcinoma_in_situ_treatment_guidelines.pdfIn PDF document text
    • http://balewezekowesab.iblogger.org/momutikumasufimebiwiwe.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/html5_and_css3_tags.pdfIn PDF document text
    • http://gooddevice-online.com/wasimevegobafudiko4ppm.pdfIn PDF document text
    • http://iuts.space/453939944064iuqg.pdfIn PDF document text
    • http://health-top.ru/10220391246jbz62.pdfIn PDF document text
    • http://demask.fun/74266843642wqu4y.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/rubesofososedutemobox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pokitudid.epizy.com/35906451212.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/vocabulary_workshop_level_d_unit_6_antonyms_answers.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/63970198579.pdfIn PDF document text
    • http://fexotupakel.rf.gd/78377337681.pdfIn PDF document text
    • http://xubibufopude.epizy.com/19583653920.pdfIn PDF document text
    • http://tewaremiluzavag.rf.gd/kugix.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 5016 bytes
SHA-256: 7362d4c592ebaa6615ff65359629be4bf4c98e552bafc4f8e416b274b6eb0c56
font_01_sfnt_off00011fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off00012b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 10736 bytes
SHA-256: 354162c9eeceaa582cf2dedd9257c364cc3d39cf3dda2d9725243145fdb0c07e

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