Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb53c9f6d2c0d0f…

MALICIOUS

PDF

75.9 KB Created: 2021-06-03 13:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 868bbf12aaf8017ae2b18a428a946624 SHA-1: d499e422852ed65fcedcbf1d6783d8b003b3acb3 SHA-256: bdb53c9f6d2c0d0f47da36f66a7bca102f0faecb09329c670137086b48f2fdeb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, suggesting it's part of a link farm or designed to redirect users to malicious sites. The embedded content appears to be obfuscated, but the presence of numerous external URLs indicates a likely intent to redirect users for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/pbw?utm_term=daniels+y+worthingham.+t%25C3%25A9cnicas+de+balance+muscular
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/45df864825d.pdf
    • https://wumotupukivu.weebly.com/uploads/1/3/4/5/134525371/witopevakonomuke.pdf
    • https://rubisese.weebly.com/uploads/1/3/4/5/134589844/9500170.pdf
    • https://lawilutimi.weebly.com/uploads/1/3/4/8/134879912/379bc03a65041.pdf
    • https://talogaxuzule.weebly.com/uploads/1/3/4/5/134596774/eae485ebe5ce10.pdf
    • https://dexajuvado.weebly.com/uploads/1/3/4/4/134470202/356699.pdf
    • https://musegozaxugovu.weebly.com/uploads/1/3/0/8/130873783/xuwewakilutuzo-vixozavoli.pdf
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/5279369.pdf
    • https://vejuxafesopekub.weebly.com/uploads/1/3/6/0/136010302/penatetu.pdf
    • https://vigodozoxofi.weebly.com/uploads/1/3/4/5/134599787/9ab06d28e19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/10a56cdd-c161-4d18-ac43-a5ddcf771f64/12592735396.pdf
    • https://uploads.strikinglycdn.com/files/91bb4893-3458-40f4-9422-b7b2d8afc12b/xebitokenup.pdf
    • http://dipoziw.pbworks.com/w/file/fetch/144439920/54367390585.pdf
    • http://molitutolu.pbworks.com/w/file/fetch/144545958/wojogiwoxapibe.pdf
    • http://visetululiv.pbworks.com/w/file/fetch/144423363/best_rainbow_vacuum_cleaner.pdf
    • http://mawasuwov.pbworks.com/w/file/fetch/144504096/how_to_use_coleman_saluspa.pdf
    • http://fadoposapat.pbworks.com/w/file/fetch/144445779/dodge_nv4500_rebuild_kit_2wd.pdf
    • https://uploads.strikinglycdn.com/files/bb0a9a91-cc21-4826-b429-5d731221f8c0/a_history_of_western_music_9th_edition.pdf
    • https://uploads.strikinglycdn.com/files/bdb2c549-e2a7-4bbd-9005-32af58dc4426/sosare.pdf
    • http://maxasol.pbworks.com/f/can_i_return_something_to_bealls_without_a_receipt.pdf
    • http://wiliser.pbworks.com/f/62158842072.pdf
    • http://lagawiwefe.pbworks.com/f/tunefox.pdf
    • http://rupebaxo.pbworks.com/w/file/fetch/144494892/83405062560.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_off0000e540.bin
df2d637fb1e2fde0b89ad7f0dc13d3d5301a1d121bb9ca6c610c1c64488b385e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 5860 bytes
font_01_sfnt_off0000f8e1.bin
69e8dce722af038fccd5a12716ef94911703b4a9a68a513ea70ddd5ac909ca6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 11908 bytes

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