Malicious PDF — malware analysis report

Static analysis result for SHA-256 8628ea08ce2bb679…

MALICIOUS

PDF

73.1 KB Created: 2021-03-01 14:32:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 073204b6e8382e4f62460b75a0f2a3c3 SHA-1: 2f03c275c0e4c2c6b5748ac372ab625a80eeb790 SHA-256: 8628ea08ce2bb679a6ca500375eed961a116936fdbcacf6bb748e5a63117b367
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the document's structure point towards a lure to download or visit a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=how%20to%20get%20your%20cdl%20permit In PDF document text
    • http://m-laskin.ru/28909347681ki93e.pdfIn PDF document text
    • http://bellissimo.online/why_is_my_kidde_smoke_alarm_going_off_for_no_reasonq0rya.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/the_lying_game_cast.pdfIn PDF document text
    • http://bijopesenof.iblogger.org/manor_park_primary_school_ofsted_report.pdfIn PDF document text
    • http://hightrade.club/zombie_roadkill_3d_gameevipp.pdfIn PDF document text
    • http://fopokigife.mywebcommunity.org/wudekuji.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/draw_straight_line_graph_online.pdfIn PDF document text
    • http://vnatural.space/hp_laserjet_pro_400_color_printer_m451nw_specifications0mzpo.pdfIn PDF document text
    • https://nutofuwinoxa.weebly.com/uploads/1/3/4/7/134719482/5994238.pdfIn PDF document text
    • http://kakasusalulul.iblogger.org/how_proust_can_change_your_life_not_a_novel.pdfIn PDF document text
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/4658eebba6f.pdfIn PDF document text
    • http://okrasote.info/animation_desk_classic_apkkdbh2.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
    • http://jilutuve.rf.gd/detailed_estimate_of_building_format.pdfIn PDF document text
    • http://tovedevekep.rf.gd/87338365425.pdfIn PDF document text
    • http://legekiwogitevil.epizy.com/disattivare_aggiornamenti_android_7.pdfIn PDF document text
    • http://tirujukixiw.epizy.com/boy_scout_webelos_uniform_patch_placement.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 4936 bytes
SHA-256: 8eb61251f684c411c42f0592964676a69b8c90e849a110447cc74382ca6b307a
font_01_sfnt_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 10492 bytes
SHA-256: 708d7ec23872aae80fb3b9f314dae4aa674e935791d7645fee45b99292902ec8
font_02_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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