Malicious PDF — malware analysis report

Static analysis result for SHA-256 46abb21a5c2569e2…

MALICIOUS

PDF

82.4 KB Created: 2021-04-06 10:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1a46a7ba49f3d841f002d1973542b753 SHA-1: 2437709bf55861d1fe8d0fa1f492b1cd97032da9 SHA-256: 46abb21a5c2569e24377c1f8305727650e3bc295decba5c98f6b66b3a738f9db
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one specifically pointing to 'resalured.ru/award', suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature. No scripts were extracted, but the embedded URLs and link farm behavior are strong indicators of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://resalured.ru/award?keyword=servidor+web+apache+libro+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470532/normal_5fe32cc85666d.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/ic4Mhd1/wooden_100_block_puzzle_wood_hexa_star_gems.pdfIn PDF document text
    • https://niladituzisum.weebly.com/uploads/1/3/4/7/134736231/lotefekowize.pdfIn PDF document text
    • http://kepukarob.sportsontheweb.net/6429756447.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/ielts_listening_test_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461483/normal_5fc97738f3987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450045/normal_5fdadbb011a47.pdfIn PDF document text
    • https://rakonudiboxenej.weebly.com/uploads/1/3/4/8/134874851/xuzigur_korozo.pdfIn PDF document text
    • https://cdn.sqhk.co/norifasil/gfjhgkh/ultimate_fall_guys_rage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486775/normal_5fe5e83c76fe9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454163/normal_5fe38b84b4d43.pdfIn PDF document text
    • http://xasowokudat.medianewsonline.com/burmese_days_ebook.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/hWqPxif/98309249003.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/9hhb2jh/97353140148.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_30ddd0ec603140b792bbcf2129cd9745.pdf?index=trueIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_5cb604af263e46b2873e672da603380c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e51ad9-bd43-434c-83f8-b5f4434a8f6e/adding_fractions_with_different_denominators_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f582f09-318b-47b2-bc03-7fceed1e6f98/48293092576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd11a7b1-7963-4be5-9886-4056a57121f3/uk_theory_driving_test_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c0b23c-77c1-498c-b824-442e09b86b96/the_cat_in_the_hat_knows_a_lot_about_that_season_1_episode_9.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_4a1880e574b64113a20eee6fa0872b83.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_95bf9be7911b463c89b37cbe83f79bee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53433363-3bad-48a2-8446-43526ae96eaa/ripitube.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_off0000ff02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 5460 bytes
SHA-256: bc50e83f5c8adccbc50df5465e4c0131f0ba0c724b078d6e40de51525965693c
font_01_sfnt_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 12392 bytes
SHA-256: 16bd8fa38876c2e98f5aedcf75fb63582d8d65a0886569ede98f0f9516ae9e3e