Malicious PDF — malware analysis report

Static analysis result for SHA-256 65aebfccd3d2fb1e…

MALICIOUS

PDF

84.3 KB Created: 2021-03-24 04:21:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6a9a5b405777b086161acf1fd23c1595 SHA-1: cecb55cabe7fc8e1cfa05b3fce625974dff4c9ee SHA-256: 65aebfccd3d2fb1e4833e2ed17f873af4b4253b43ebfe1874da95599fe3f4620
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, and the document body, though garbled, suggests a lure related to 'measurements and uncertainties ib physics answers'. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://soxebez.ru/123?utm_term=measurements+and+uncertainties+ib+physics+answers PDF link annotation
    • https://zunudomulu.weebly.com/uploads/1/3/4/6/134604261/segukewovutiki-navevub-gadupogovuvav-sesilobajaki.pdfIn PDF document text
    • http://vovavipegum.getenjoyment.net/bcs_preliminary_result_40th.pdfIn PDF document text
    • http://tanenabav.getenjoyment.net/12778947828.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451205/normal_6008f86f50679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_6049064615248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_602a7d23aca57.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/pesix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_60470c3803969.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/ways_to_prevent_climate_change_at_school.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/gureza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408993/normal_6011d0c769a12.pdfIn PDF document text
    • https://wulilunize.weebly.com/uploads/1/3/1/0/131071037/pevonutum.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/MkL4jeT/kuwol.pdfIn PDF document text
    • https://kiparefewegapip.weebly.com/uploads/1/3/2/6/132682538/7959122.pdfIn PDF document text
    • https://cdn.sqhk.co/lowanivari/fjeheyF/material_status_report_table.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/ed618154-8a9d-416c-8f3b-02697f903363/twilight_breaking_dawn_part_2_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a7c441-951c-43af-9b44-c02505f9c19a/misigupiputix.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_c039819313094caa851db0bb5aa9efad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e5f31f-f295-4a7a-b401-3c871995dc62/2013_dodge_avenger_transmission_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da25af3e-67be-4e76-9bba-1b73ead8263e/how_long_do_lg_refrigerators_last.pdfIn PDF document text
    • http://falariwupap.myartsonline.com/jufexoxokumejosezid.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_097eb5e9d7e442d6b3479bd6ebff084f.pdf?index=trueIn 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_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 5392 bytes
SHA-256: 04ef3acadcaa2491b719a7b513efe099014793f2fd4f77c9f4a7f2b20a034ca7
font_01_sfnt_off00011067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11067 10808 bytes
SHA-256: d3f6df024e0fa0ba88d18175d10efcdbd599e625b8832864c5a32f9abc1a927b
font_02_sfnt_off0001353e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378