Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fe55c153bd03a3…

MALICIOUS

PDF

78.0 KB Created: 2021-04-05 21:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 46e86282680f760437e6cc92ec7c6d03 SHA-1: 97daf1a281d9894a11235a0eb89ad7de1b14752b SHA-256: e2fe55c153bd03a3ea6b596f4c21846979f2ddfbd652235b3e21eb9b084cdb28
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It contains a large number of external links, suggesting it's part of a link farm designed to drive traffic to potentially malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and time. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=night+webquest+answers+key PDF link annotation
    • http://ing-cliente.com/tejeruwaezjgh.pdfIn PDF document text
    • https://vifaniju.weebly.com/uploads/1/3/4/5/134507083/dafupexes_zarofogujunepal_wosapebimetuwe.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/pogatuxetub.pdfIn PDF document text
    • http://megatorg.ru/59218320391k115.pdfIn PDF document text
    • http://ig-copyrightviolation.com/speed_queen_tr5_vs_tc5_reviewsydg5v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366664/normal_5ff8ac64e337e.pdfIn PDF document text
    • https://zediruli.weebly.com/uploads/1/3/4/7/134725524/18097e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483337/normal_602d82a0966bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496378/normal_5fed4fb7aa960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_605fa9cf6f219.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/594033998169bdyv.pdfIn PDF document text
    • https://tiforunu.weebly.com/uploads/1/3/1/4/131437018/toguvojuwoja.pdfIn PDF document text
    • http://instapresent.site/mozasuej597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_5fd63842e82cd.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/fajujiju/someone_like_you_van_morrison_female_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b0111c-01c6-4bf4-8da4-08540ffe8022/which_john_grisham_novels_have_been_made_into_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af2e1268-186b-4584-ac21-98a8e74efbc4/36085552461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c341a318-a0f9-4f1e-8915-8a996eefcd38/rizokuzovexarozal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f12d3f99-e010-4da7-849a-5d9fac0fab94/ez_go_powerwise_charger_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/garmin_gps_126_manuale_italiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d266c5-f1e9-4c46-a1ee-af5089945369/focusrite_scarlett_2i2_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00dcc062-d72b-4238-9e2f-5574e62e6969/how_to_make_a_girl_like_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4dc64c6-8d9d-496e-bbc1-43671c2eca6d/78074192183.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 5408 bytes
SHA-256: c2c8d502278d39763891c4c4a631637c2d5fbfbfd562ee4e230e69eb490f6a8d
font_01_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 10612 bytes
SHA-256: 82abe16b6267a5435804da3650ffe8ae91c1cbd5bdc8f918afe338040aea8a5d
font_02_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15