Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72edd77fe934134…

MALICIOUS

PDF

111.8 KB Created: 2021-03-24 17:30:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33c175b0b008db91d8442e2ca598c7b2 SHA-1: 7cc9e79cc6ffb913179eb6bac0543cf8b14c46a6 SHA-256: f72edd77fe93413495299a04ae02598c123897df3eb63ffe1a420a1ae50d8f3a
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, one of which is directly referenced in the document's metadata as 'https://jacksth.ru/wix?keyword=bohr+atomic+model+worksheet+answers+key', suggesting a lure to trick users into downloading further malicious content. The presence of PDF_URI and EMBEDDED_URL heuristics indicates the document is designed to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • 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://jacksth.ru/wix?keyword=bohr+atomic+model+worksheet+answers+key
    • https://vijunefuk.weebly.com/uploads/1/3/4/5/134588972/8766993.pdf
    • https://cdn-cms.f-static.net/uploads/4480876/normal_603ab555df203.pdf
    • https://jebasiju.weebly.com/uploads/1/3/1/3/131381450/0c2ccd31380c9e.pdf
    • http://studyweb.site/platformio-_ide-_terminal_for_atomjwnq2.pdf
    • https://cdn-cms.f-static.net/uploads/4454691/normal_60499d5b872e1.pdf
    • https://dufofumiwiz.weebly.com/uploads/1/3/5/3/135309849/malowitasal_fekiwimaxij_gaxuz.pdf
    • https://kusafowagu.weebly.com/uploads/1/3/1/8/131871480/jidowixoz-kowuveziz-tegip-bedef.pdf
    • https://jowetirepenu.weebly.com/uploads/1/3/1/3/131383619/kozenepudiso.pdf
    • http://temppicture.xyz/faredamidozinizoloxepadzjd9.pdf
    • https://cdn-cms.f-static.net/uploads/4496013/normal_605ac59966e5e.pdf
    • http://reactivaperu-2020.com/25712507179gcixg.pdf
    • http://itasummer.fun/20212203509pipo1.pdf
    • http://shtancircul.site/55610365526ej3xa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bc7db6a1-5ce5-4acd-a8f7-03862c3d55bc/19876575860.pdf
    • https://s3.amazonaws.com/gazivemon/1819242570.pdf
    • https://s3.amazonaws.com/woxojuxafopuv/bazagozirorawegamafutepuv.pdf
    • https://uploads.strikinglycdn.com/files/bb986fab-305d-4e63-85cc-1c90927e65bc/natozitojad.pdf
    • https://s3.amazonaws.com/kelukakeb/lonely_planet_cuba_ebook_free.pdf
    • https://s3.amazonaws.com/regovadeje/pofolizeviwulofilugaxaz.pdf
    • https://s3.amazonaws.com/gadumagabusodel/frutas_con_antioxidantes.pdf
    • https://uploads.strikinglycdn.com/files/defc8f13-3d06-4d28-a60d-56e9e14ac36a/47776765234.pdf
    • https://uploads.strikinglycdn.com/files/b337223d-8bb7-4f2a-93ee-6217a7455f21/94770830079.pdf
    • https://uploads.strikinglycdn.com/files/aaff20a3-f3b4-401f-a105-c8f2a90e5941/molecular_biology_of_the_gene_7th_edition_by_james_watson.pdf
    • https://uploads.strikinglycdn.com/files/bb726086-e694-499f-8080-75e4d7b71fbd/difference_between_food_web_and_food_chain.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001709f.bin
3b89a1333aa93e194de12c5c5da229a8f3a969ace6b07a90c5323b9ece6747ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x1709F 2828 bytes
font_01_sfnt_off00017a9a.bin
3ac86ecf84d16d0f37f77ce08fb08cca06d0e40f7e7ea28f49935cf9cff94ea5
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A9A 5484 bytes
font_02_sfnt_off00018d2f.bin
2f78fa2a8023f53070612601cc83f075b5aefc9d7e4494d233dfda7d44af284a
pdf-font-stream PDF embedded font (sfnt) at offset 0x18D2F 10324 bytes