Malicious PDF — malware analysis report

Static analysis result for SHA-256 7904e8f4482e38aa…

MALICIOUS

PDF

76.5 KB Created: 2021-03-20 07:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2ff97cbe238aa05a257fe4231b12b0c4 SHA-1: c62881add9982176a896736dded574799fdbfaef SHA-256: 7904e8f4482e38aacc5c9c95d49feb129b2feb376028974626c956b2e085c4ab
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though truncated and obfuscated, appears to be a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=displacement+and+velocity+worksheet+answer+key PDF link annotation
    • https://wazufepema.weebly.com/uploads/1/3/5/3/135383665/2161196.pdfIn PDF document text
    • https://vafebukuwu.weebly.com/uploads/1/3/1/1/131163563/bogina.pdfIn PDF document text
    • http://gevowavu.22web.org/41205387868.pdfIn PDF document text
    • https://kuwovuvonix.weebly.com/uploads/1/3/5/9/135971109/c64cd0a5.pdfIn PDF document text
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/sokomokejodapox.pdfIn PDF document text
    • https://vufobuvi.weebly.com/uploads/1/3/1/1/131163959/felikufed-pamarif-karunawebugugi.pdfIn PDF document text
    • http://dvestideyli.xyz/wivizubobelaxebokoxamogufdvnt0.pdfIn PDF document text
    • http://insta-sale.site/nyt_movie_review_whered_you_go_bernadettet1h68.pdfIn PDF document text
    • https://xajobukemuxup.weebly.com/uploads/1/3/5/3/135398270/628343.pdfIn PDF document text
    • http://tapadobav.iblogger.org/xafonuxon.pdfIn PDF document text
    • https://davavenetu.weebly.com/uploads/1/3/4/5/134500413/wejero.pdfIn PDF document text
    • https://labuxodapiju.weebly.com/uploads/1/3/4/4/134492440/lokavifin.pdfIn PDF document text
    • https://lafefetakizin.weebly.com/uploads/1/3/2/7/132712235/a4b53ba1c744.pdfIn PDF document text
    • https://vinovebavelugis.weebly.com/uploads/1/3/1/3/131383284/jogofo-rolimupugu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/29305960-f14c-455a-badf-45de6a21363c/tirepugalazexurig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a7318a5-332d-4518-bd69-ba3c93ad57db/tezunexazido.pdfIn PDF document text
    • http://wepezip.epizy.com/rilufalebumuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee22c33a-f285-45d5-b303-09e47541bd63/90302630585.pdfIn PDF document text
    • http://bobamexexaru.rf.gd/iphone_x_emulator_for_android_studio.pdfIn PDF document text
    • http://jefokid.rf.gd/fundamentals_of_acoustical_oceanography.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_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 5628 bytes
SHA-256: e17f91004951cc256b156f70dcb888b5f88963559cbf6d2989119026a161bbbf
font_01_sfnt_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 10404 bytes
SHA-256: 139729afe7f21da4a7fe451fb1ffb1ad03e7dc33e446c643112253e041eb5c63