Malicious PDF — malware analysis report

Static analysis result for SHA-256 35eabe87ddd42f98…

MALICIOUS

PDF

81.9 KB Created: 2021-02-18 11:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f979b478d6d3d7c0e926360162069cc1 SHA-1: 596b4ea085bd6e77b20ee40a971d09b6a963f83c SHA-256: 35eabe87ddd42f988e63254d8c2ee0b44c642dca775ec49cc2e8362c8798e2f1
214 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to search engine optimization, suggesting the links are part of a link farm designed to manipulate search results or distribute malware. No scripts were extracted, but the presence of numerous external links strongly suggests a phishing or malware distribution campaign.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=who+manufactures+refrigerators+in+usa In PDF document text
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/vexajo.pdfIn PDF document text
    • https://guzovadolo.weebly.com/uploads/1/3/1/6/131606502/gipupujonenofov-dujaruvezav.pdfIn PDF document text
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/6f3c35.pdfIn PDF document text
    • https://cdn.sqhk.co/sivojadirabe/hhhvihV/annoying_sounds_10_hours_baby_crying.pdfIn PDF document text
    • https://cdn.sqhk.co/jebanufebejo/7n1Im8H/minecraft_mansion_seed_2020_pe.pdfIn PDF document text
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/lewisulafigirim_vubojuketo.pdfIn PDF document text
    • http://momentikshop.space/exercices_corrigs_basculesq7mfc.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/haZjd5j/gumball_3000_net_worth.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotonolo/Thchggf/virus_wars_space_shooting_game_mod_apk.pdfIn PDF document text
    • https://xariwavunulopex.weebly.com/uploads/1/3/1/4/131406448/1716acc063.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/ada_guidelines_for_perioperative_management_of_diabetes.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/49548336545.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/jingle_bells_alto_sax_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/13552176043.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/adventure_story_in_english.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_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 5276 bytes
SHA-256: c96bad063cca10c5ec547ea7d6530c1c7e68fe6718672b9a5aa929177820bac8
font_01_sfnt_off000116ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 10476 bytes
SHA-256: e25631220f004612a1075416b1d7907d0857c5bf1ce1fa29957f4dec9ab874cb

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