Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5b395f41f45a2a…

MALICIOUS

PDF

67.8 KB Created: 2021-04-03 20:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05bc3f42bc73acfb985f2f0dbc972d74 SHA-1: f62226edfde0e1b4f6ffff6f4e3c40643b5ff238 SHA-256: 5e5b395f41f45a2a2240cf2c21536eda8a0d047947b4e3d0150f7ae9d396d645
136 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of external URIs and a heuristic indicating LOLBin usage suggests an attempt to download and execute a secondary payload. The document body, though heavily obfuscated, contains text that could be used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://bologen.ru/123?utm_term=double+sheetrock+insulation PDF link annotation
    • https://cdn.sqhk.co/lijusute/cibnZJO/vlinder_girl_dress_up_games_avatar_creator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_604513a9257a5.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/RViaqZG/8639338.pdfIn PDF document text
    • https://cdn.sqhk.co/jadidawa/jdThafA/zegoriv.pdfIn macro / runtime command snippet
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5feb7c33cda31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490252/normal_5fde03c163962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_606358fc8475a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_604d22386d61b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426823/normal_5ff370434d1fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390095/normal_60502ac383cda.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/hiiZ8jb/karuxede.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/Lcjjidl/nccn_guidelines_papillary_thyroid_cancer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_604d0c0ee4fdd.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/3b1cf22f-86dc-4938-979b-3557d2669067/craftsman_router_table_saw_combo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/066f7991-db6e-445d-83e6-06e32265b989/what_does_s_curl_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e4f15c4-9f86-421d-8cf0-8bd956aa3a2e/how_to_train_your_dragon_viggo_voice_actor.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/gozifep/boogie_wonderland_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/vafivitetebobanuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f41b824-2bf5-4131-ba44-a2fae9994ac7/bassham_critical_thinking_a_students_introduction_5th_ed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd502f5-71f8-4b0e-a0e3-7f3d5472343c/19872297566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6f9c95-5e98-4d93-bad7-810a22dfd0aa/taradokafudalofekum.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/nibikavovip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d3c6ffe-e16b-4f33-ba2f-396e86b5d49c/vbh_nfyrjd_kbw.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/xolodor.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/best_way_to_get_rid_of_poison_ivy_rash_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8365abb2-6df6-4229-8b51-d9b5462206df/ridaxorepadilepamikonek.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_off0000cf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7A 5092 bytes
SHA-256: 664bc63a67413f2a4d4ad6dcf7d82b8dddf8a0e40800c39db61246ce1fafaf08
font_01_sfnt_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 9636 bytes
SHA-256: bcfefc76316c4554a2e7798860421bb75e56a74171a6dbcbaa51e0a32f3d8c5f