Malicious PDF — malware analysis report

Static analysis result for SHA-256 e803b5f9aaca357b…

MALICIOUS

PDF

77.6 KB Created: 2021-03-23 07:06:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ad6833caf1e1951cb903ba94c6bd3c2 SHA-1: b775d8dda5b88cfbb4abe08c68a1732608826de9 SHA-256: e803b5f9aaca357b0ad67b907e8ee7fb33a1dbc81f124535f482c9835e369cab
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, references "Dictionary of demons michelle belanger", which is likely a lure to direct users to malicious URLs such as https://pelibifir.ru/strik. The presence of PDF_SEO_LINK_FARM heuristic further supports the malicious nature by indicating a mass of external PDF links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=dictionary+of+demons+michelle+belanger
    • http://premial.su/268462418620qj6x.pdf
    • https://cdn.sqhk.co/wazilisiko/rOhiie9/wovofubutatavajefes.pdf
    • http://idslim-italia.site/rivofiluzibusm3cl.pdf
    • https://wijununag.weebly.com/uploads/1/3/1/4/131438003/d7efa7.pdf
    • https://cdn.sqhk.co/munoforifuso/Nibhgyp/pazixodo.pdf
    • http://www-sfr-fr-monespace.com/valley_of_the_dolls_book_free7wxhl.pdf
    • https://cdn.sqhk.co/sugezigo/xifAigX/keraxovonawaxeri.pdf
    • https://cdn.sqhk.co/pelopuxi/m97Hie1/rodibetojamoxiduseseja.pdf
    • http://heliusdesign.ru/recargar_paquete_amigo_sin_limite_telcele97n8.pdf
    • https://nozagovedenide.weebly.com/uploads/1/3/2/6/132682533/55de1ee157a7.pdf
    • http://help-feedback-amzn8.xyz/60573973550m0bbm.pdf
    • http://amandeepsadyora.com/social_learning_theory_definition_criminology5g8m0.pdf
    • https://tiwovukixata.weebly.com/uploads/1/3/4/3/134314311/zelipusevuxefizemoma.pdf
    • https://cdn.sqhk.co/givujelised/dijjjgd/gotuxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_3f4d2ab53fbd489fb3b9e0373268c03a.pdf?index=true
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_6c9e83264be64ac28a06aec028d46546.pdf?index=true
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_84f44574d39140558dc1f99c9276c19d.pdf?index=true
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_bdf0b88030cd4ac8b423258b24c859e2.pdf?index=true
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_bbf364d73d5644c992ea5995c7621d99.pdf?index=true
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_1ed27ff1d6e94a77831a0c71bd2a9bce.pdf?index=true
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_1eb925d81b8a438da378785213024079.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff4.bin
f558c52a6cc827264bbf198d43af43f6f1ef147818790123084d2e5aa30ea189
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 5676 bytes
font_01_sfnt_off0001032e.bin
8801b9525a4fe00ccec2599425c65350436b798f765fc9e4948d04b8922cdf4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 10960 bytes