Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bcde3a7d0e75f6…

MALICIOUS

PDF

77.4 KB Created: 2021-02-26 04:29:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5bb948cb79ceeeb556a40c6ebd2b3528 SHA-1: 4cd390520b3a1dfcc2659ecdf41fb1af6afe4284 SHA-256: b2bcde3a7d0e75f6db4b9fe50f4849b1c1257dfbb5fd8247c654969261395fc8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link suggesting a search query lure. The heuristic PDF_SEO_LINK_FARM indicates a large number of generated links, likely for SEO manipulation or to host malicious content. ClamAV and ML classifiers confirm the malicious nature, identifying it as a phishing trojan.

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
  • 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.
  • 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/award?keyword=how+much+is+justin+guitar+subscription PDF link annotation
    • https://zedijonen.weebly.com/uploads/1/3/4/0/134018258/buvawo.pdfIn PDF document text
    • https://rorenaziva.weebly.com/uploads/1/3/1/8/131871817/3169331.pdfIn PDF document text
    • https://nagiliju.weebly.com/uploads/1/3/1/4/131412426/1720733.pdfIn PDF document text
    • http://azorocheat1.xyz/52700893709km35z.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/pogimenisurinefofojid.pdfIn PDF document text
    • https://radixukawatezod.weebly.com/uploads/1/3/4/6/134645496/7d4bd.pdfIn PDF document text
    • https://jurijibo.weebly.com/uploads/1/3/0/8/130874645/favovuramigov-mifowegi-silurix.pdfIn PDF document text
    • https://susakatevasek.weebly.com/uploads/1/3/4/8/134871092/xivarubakeriwodotu.pdfIn PDF document text
    • http://straponartist.com/zewabu6msiv.pdfIn PDF document text
    • http://respect-ltd.su/59950338029nltmj.pdfIn PDF document text
    • https://karifizamazo.weebly.com/uploads/1/3/1/3/131383674/0495c7068c8.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/fodose/adecco_salary_guide_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/vozudun.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/girozalidaguketekis.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/wheels_on_the_bus_cocomelon_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/zizonowo.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_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 5584 bytes
SHA-256: 7da0e376411f014b85ca3a2a86031fae80eb2813dc4e8468bd04c9bdccae336c
font_01_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 10768 bytes
SHA-256: ee055288e6cd8088f87909102ff48e564f634298dd885f25ddb6c2eddd2c77fd

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