Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e3dbc73a35676c…

MALICIOUS

PDF

80.2 KB Created: 2021-03-17 01:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: eb94636f89f51d03257433a43cee7920 SHA-1: 1f003ec95fd8f220247194f715084b939b78f342 SHA-256: 87e3dbc73a35676cc739666e1e374dee95ab66101cd707ef67d055925e36098b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs and a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'Prsd school district' and application metadata, which could be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=prsd+school+district PDF link annotation
    • http://cetapp.xyz/35567694349q2i74.pdfIn PDF document text
    • http://petersikdar.com/kitchenaid_-_white_pro_600_6_qt_bowl-lift_stand_mixer_-_kp26m1xwhjyw4q.pdfIn PDF document text
    • http://luminar4-download.xyz/padutilodekr1qvw.pdfIn PDF document text
    • http://my-favshoph.online/who_plays_the_candle_in_a_christmas_carol04fd5.pdfIn PDF document text
    • http://yblda.fun/tirowodajimotosidurujo86pw2.pdfIn PDF document text
    • http://cyberlife.store/vojotuzorofeliljg992.pdfIn PDF document text
    • http://wgathering.org/call_blocker_for_android_without_single_ring82blv.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/0c4d738a-676d-4bbd-bd62-1159cb318a41/walosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3707d06-4c13-4319-861e-fd4109e2aa0a/56949778392.pdfIn PDF document text
    • http://ratoweke.rf.gd/silaronuwuzexifuxikib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc2f06f3-fb3b-4227-a08f-ec52565ca7a0/kixajutajifusimajamepotoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7093d6c8-8cd0-4e3b-a136-d5072363481e/xojisisokawataxax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6053eae3-8bd3-4f05-b0c3-289ce7f3aa53/mijepugeribojijusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4fc8d7-521b-4fb3-941a-fe0956527c6b/82343228657.pdfIn PDF document text
    • http://pexirofovuj.rf.gd/links_awakening_switch_walkthrough_key_cavern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e458a7-2074-442d-9840-e9e189a2d238/were_ancient_roman_buildings_painted.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86396abd-1973-45a6-b52f-51b5d42b3e46/sherlock_holmes_books_vs_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ebfd1d5-3f54-466b-bc53-8055fe199ca8/what_should_you_do_before_buying_a_used_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/510ec1ca-4369-41b1-9237-45f252c09ff7/kelanokavozisuginuruweke.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 4820 bytes
SHA-256: 513633936d9226e68b9c7a7275f1f4ed145e6082b6e43089947b3cd4483fce13
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 11240 bytes
SHA-256: bc13723f2fd6e6d9c4937630591e7e6a4e7822af19d6ffe9a42432e7769aaea7
font_02_sfnt_off00011cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDF 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e