Malicious PDF — malware analysis report

Static analysis result for SHA-256 7671c78052bf5224…

MALICIOUS

PDF

90.9 KB Created: 2021-05-20 15:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ce071c6e39c7dcbb4b8b8f0f605aebbd SHA-1: 0a2868bae9eea5008f8bed4393c6cc8190bf8f9b SHA-256: 7671c78052bf5224473725a1b9fe8ba74d3662661e6cd07ec3ea325726c752a7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain ('maypoin.ru') that is likely part of a link farm or phishing operation. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to malicious content, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://maypoin.ru/strik?utm_term=cuadernillo+de+actividades+para+primer+grado+para+imprimir+argentina PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365563/normal_5ff346d72123a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_6008e10654079.pdfIn PDF document text
    • https://tuganokume.weebly.com/uploads/1/3/1/4/131452880/e529a35383de11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_60551575302fa.pdfIn PDF document text
    • https://jugotogosef.weebly.com/uploads/1/3/0/8/130814460/nawepid_volip.pdfIn PDF document text
    • https://riguniliwegab.weebly.com/uploads/1/3/5/3/135342973/nixipetuku-binelimope-marox-zelebo.pdfIn PDF document text
    • https://libosimi.weebly.com/uploads/1/3/4/0/134000241/nalilafigisevino.pdfIn PDF document text
    • https://zizizibewanexu.weebly.com/uploads/1/3/0/7/130776642/damovujezowa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6097d4ba-689e-43b3-aa1f-7c2da053d30e/sig_sauer_p226_legion_magazine_capacity.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/how_to_become_reiki_grand_master.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f72fce2-cbb1-4aab-950d-6d3985d5a357/whirlpool_dishwasher_wdt750sahz0_upper_rack_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/learn_to_speak_arabic_app_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/entertainment_news_reporter_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94416fd5-3e52-431e-ab09-2587ebf4d263/mamiya_rz67_pro_ii_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81f32de4-0a4d-453f-b893-b6fdca3415a1/how_to_download_adobe_premiere_pro_for_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/toxezigavutuxas.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/naxowalunavapukaxupo.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/femtocell_technology_seminar_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/how_to_get_rid_of_acne_scars_on_back_and_chest.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/upsc_2016_answer_key_insights.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 3160 bytes
SHA-256: 914af2359fe057d0dff6cfa70fddc35f4bc8dc4192c5ead921e268c2c745490a
font_02_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 5356 bytes
SHA-256: db983dca032856c065760f9c41f910c1e4d24afe328d4612baa87633e6227391
font_03_sfnt_off00011b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B82 2328 bytes
SHA-256: 24b23dba2be487830cca5a45649190bea69c7faaa5beca93a7e9259a475e9764
font_04_sfnt_off00012602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12602 12392 bytes
SHA-256: f12d96a1800b199aa832834c68f8e1f5b1de5c8842de5f10b49ddf9e8a12dd4c
font_05_sfnt_off00014db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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