Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4828096d8334677…

MALICIOUS

PDF

78.9 KB Created: 2021-03-31 23:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfe6fd9d0221698270b6df20af749570 SHA-1: a097144c164b481260b1afa2c13658745b2c217e SHA-256: b4828096d83346770860a69281edf086b36a1951db80b47d5b0ff1c14343890f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of an SEO link farm designed to manipulate search engine rankings or direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to potentially harmful sites.

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://druttle.ru/wix?keyword=45-90+express+ballistics
    • http://dimivetow.iblogger.org/67650614635.pdf
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/581df18fa5.pdf
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/5204182.pdf
    • http://otshelnik.net/pefevafatagirigiparates3j3of.pdf
    • http://twobigs.space/21659350175zssxe.pdf
    • http://nuverlites.online/vomedujdbpd7.pdf
    • http://student-yurist.ru/zomefa54o72.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_2912566bc06645f198c50d090030afc2.pdf?index=true
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_b07626c10a51414ca9e5a8cdf039effa.pdf?index=true
    • http://perememis.epizy.com/arithmetic_logic_unit_in_computer_architecture.pdf
    • https://uploads.strikinglycdn.com/files/6e082d0f-51af-4ab4-b865-66bc9284086a/8075310961.pdf
    • http://roxeruteruda.epizy.com/68159229010.pdf
    • http://bixerexexotepe.rf.gd/english_textbook_for_class_10_ncert.pdf
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_52e0cb1d6f58402da8b3a2a0a72b8c38.pdf?index=true
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_70dacd858c1b4c5a92eadc0a1b7bebe7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f03a9306-e11b-4932-acf1-7163ef55041d/sword_art_online_alicization_war_of_underworld_release_date_english_dub.pdf
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_edb68293c97d43068532d3463edfe760.pdf?index=true
    • http://roboketisi.rf.gd/tukuvopaxuwiwelerojaro.pdf
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_41b1d66e7a3d49f99d299f6679aa752e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7454011e-e054-4332-bbcd-5dd6909a63d8/jutejakumuzopanekofemuga.pdf
    • https://uploads.strikinglycdn.com/files/12319f53-62e4-4e88-9338-a5232dc8eb5c/xerakolematoso.pdf
    • https://uploads.strikinglycdn.com/files/52089130-9c65-4b02-a378-cd71acadbf66/58632599390.pdf
    • 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_off0000f519.bin
9a1fa1d2bf1a2b305233a757aafa5a4b51d2994cf61b04cc93e7ecf67c7e944c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 5584 bytes
font_01_sfnt_off0001082e.bin
c6f85f1167bfcdaa20d6be1911d02297c3cf8c78c061650bf9b21a3df86a9eb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 11088 bytes

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