Malicious PDF — malware analysis report

Static analysis result for SHA-256 1166cd9c5b40f294…

MALICIOUS

PDF

124.4 KB Created: 2021-03-23 12:17:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 02f8e91ddb2cc51885407a8ddb5d6799 SHA-1: 15b94906d48193bd87cd3f2d71480d1e85f56d9e SHA-256: 1166cd9c5b40f2948216b237dd8fb52ba058c12998676e8442ffeba4df7d7259
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains text suggesting it's a lure related to 'ap world history unit 4 test answers', directing users to a suspicious URL. The presence of numerous external URIs, many hosted on disposable domains, further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jacksth.ru/wix?keyword=ap+world+history+unit+4+test+answers PDF link annotation
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/1dbce86508cfed.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/add_text_to_free_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/badilapo/n7jiCie/jeninorujofafagelawasar.pdfIn PDF document text
    • http://woronari.getenjoyment.net/indian_vegetable_dishes_for_dinner_party.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/moxukogukuwutalamafu.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/xojixames.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/ihiehcE/homemade_raspberry_jam_healthy.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/5Fghcgd/brain_teasers_for_high_school.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumabigige/9gijjcd/go_jump_mega_park.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/wuzatexageduvobimun.pdfIn PDF document text
    • http://pezuxedazof.iblogger.org/bonejudesufoweto.pdfIn PDF document text
    • https://gidutuzewefira.weebly.com/uploads/1/3/1/3/131380066/1504730.pdfIn PDF document text
    • https://cdn.sqhk.co/runusamopit/eRjfhdA/click_charli_xcx.pdfIn PDF document text
    • https://vifelewumatorav.weebly.com/uploads/1/3/4/6/134669873/zabifonavado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xinimegofuf.epizy.com/veg_recipes_of_karnataka_chutney.pdfIn PDF document text
    • http://tefabawamibane.epizy.com/zofagomenizusulebukolel.pdfIn PDF document text
    • http://tafobinememen.epizy.com/nikon_d5600_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d659f987-ed7f-4271-a5ed-c9bbf290b82a/what_is_a_wireless_video_bridge_directv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/477e89cc-923b-452f-bbb4-1b79f20a7a3f/mobility_scooter_battery_box.pdfIn PDF document text
    • http://patelaforal.epizy.com/how_to_set_timex_ironman_triathlon.pdfIn PDF document text
    • http://gulaguwiz.rf.gd/mujujusefefeguteripa.pdfIn PDF document text
    • http://wotatamejutelet.rf.gd/doctrines_of_salvation_army.pdfIn PDF document text
    • http://limazajot.rf.gd/jetavimonofak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/081cb51d-d543-4d8c-8ff7-cba77f3dc2f4/13300820135.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2E 5320 bytes
SHA-256: 79cac7ab7a70a9f9e3c540368a8832973eeca443fdf2fa91a7311bcb12136e9c
font_01_sfnt_off0001614b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1614B 24844 bytes
SHA-256: d2358997791e69a72a40006dd4b50acc5eef9dcfc78d0143ab411ac88c0bc84c
font_02_sfnt_off0001a2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2C0 11780 bytes
SHA-256: 8ce9fb90216a6894f3072f74a9c5578f219effa53f72659fa1a7d9e7e79461d2
font_03_sfnt_off0001cb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB0E 16392 bytes
SHA-256: 1d7d90f94dfa848d0b38b8fb009b5a890d4c4a809fd4876252b044d720995e7a