Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa7b5e7600b44cd…

MALICIOUS

PDF

83.1 KB Created: 2021-04-24 16:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ff0588db79d72a0c2ec6a3cf73860d0d SHA-1: e7857fbbf5c0f39d62e3959fbb9a05c8d8fc05e9 SHA-256: 8aa7b5e7600b44cd3feb20ef5f8d87622f1a49b1078ce800ce96b323d38dc1c5
186 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, including one pointing to 'jottigo.ru', which is likely a phishing or malicious redirection service. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, which in this case appears to be a lure for stock market courses.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://jottigo.ru/strik?utm_term=which+course+is+best+for+stock+market PDF link annotation
    • https://dabagurujor.weebly.com/uploads/1/3/4/3/134350609/7483846.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5fe39d6fac2a9.pdfIn PDF document text
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/237ed77d61945f.pdfIn PDF document text
    • http://hookup755.fun/960750221613mesl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421036/normal_5fce5d5c4c7c9.pdfIn PDF document text
    • https://dosisusibifoba.weebly.com/uploads/1/3/4/2/134236234/luliwemewasap.pdfIn PDF document text
    • http://stavki-na-sport.site/how_do_i_put_my_sonos_in_pairing_modeglsnf.pdfIn PDF document text
    • https://fenogelojana.weebly.com/uploads/1/3/4/9/134904444/xidisol_lapigunaxizoge.pdfIn PDF document text
    • https://foxewazijibaj.weebly.com/uploads/1/3/1/3/131379544/86255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_601b61dac5f7c.pdfIn PDF document text
    • http://stebsmeh.space/967306922811lzr4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5ff98cbc3a02d.pdfIn PDF document text
    • http://natur-bio.space/41598353633h7hpf.pdfIn PDF document text
    • https://kujuxase.weebly.com/uploads/1/3/4/5/134584075/7629442.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369487/normal_5feec01e48c4a.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/3952575.pdfIn PDF document text
    • http://voirlo.xyz/spm_mathematics_formula_listy6h86.pdfIn PDF document text
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/leduwa-guzozosezage.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_c8033c25fa67476c8674856156bbcd49.pdf?index=trueIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_4140b45a17184c4fb02848c084592840.pdf?index=trueIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_d6ea2f6961f24edd979b35c407e644ac.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_41af8e3f16c84db6b7c902012253f1c1.pdf?index=trueIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_fec5486dee7142e291ae90d43558c180.pdf?index=trueIn 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_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 5304 bytes
SHA-256: a4770d5d5388ef26c2a4b763623e7a83334d8d4d7c6adde71d5576d79643c418
font_01_sfnt_off000119e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E1 10596 bytes
SHA-256: 67c13a0542882b74359460e53455d617507b193c6d13ef9011a299788cc97c19