Malicious PDF — malware analysis report

Static analysis result for SHA-256 155297aff57f1a6d…

MALICIOUS

PDF

67.7 KB Created: 2021-03-25 01:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e7b77d0f3bb6c867aa399b31d71f6ed9 SHA-1: 7e7e1de3355098d96883f36ea0dbe592f1a9fce9 SHA-256: 155297aff57f1a6df50f7cb4daa5a92063dd97536177bd797cab49785c9f53ff
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO link farms or phishing campaigns. ClamAV detection and ML classification strongly indicate malicious intent. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing 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
  • 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://maypoin.ru/award?keyword=open+pdf+file+in+browser+with+modal+popup+using+jquery PDF link annotation
    • http://idealicaufficiale.website/bostitch_btfp02012_specsiiwvu.pdfIn PDF document text
    • http://boomerangoo.site/altec_lansing_life_jacket_2_wont_turn_offxsa5q.pdfIn PDF document text
    • http://sizegivip.22web.org/96222042406.pdfIn PDF document text
    • https://lugulake.weebly.com/uploads/1/3/4/7/134763312/zokowunejoju.pdfIn PDF document text
    • https://dizubegunusu.weebly.com/uploads/1/3/4/8/134889053/7d942918e36c.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/fibewuwusapif_lanaxosedukota_tawasisanukera.pdfIn PDF document text
    • https://seremojalunukeb.weebly.com/uploads/1/3/5/3/135393353/f79c7513.pdfIn PDF document text
    • http://quickstore.pro/81148172596wgi1o.pdfIn PDF document text
    • http://xsale.trade/33029901713swr9l.pdfIn PDF document text
    • https://keminugugenoxag.weebly.com/uploads/1/3/4/3/134321568/gebomi.pdfIn PDF document text
    • http://voirlo.xyz/unravel_meme_song0sdqd.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/povamisasumar-fikux-nevibare-letatilefatub.pdfIn PDF document text
    • http://nolaxevoxuvelij.iblogger.org/dubai_airshow_2019_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_5516c48b93dc490ea5c0aa996640e133.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_3656cc0da62c42e1a3820935f0e9b365.pdf?index=trueIn PDF document text
    • http://rawelusovonifax.epizy.com/xogam.pdfIn PDF document text
    • http://dimavimamanonev.rf.gd/gheorghe_bratianu_marea_neagra.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_0f430b9d97f5489bbd56b730bb2c256d.pdf?index=trueIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_15457fe41b1a4c5f986dd59180919f9e.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_ddeea366a747420ab5a60a47f7ceb2e4.pdf?index=trueIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_c42229e7c5d14d98a6816caf33750505.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_off0000c9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FC 6016 bytes
SHA-256: 25d32d7a410e3b4dbdf697023fafabcec65b5a51e11cdbac4cc6d4e29cc660dc
font_01_sfnt_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 10244 bytes
SHA-256: 45f35e4557e7a97c8def33b5b6ea01d5852318dc67433f3818a74319926524eb