Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf776738a622a1c…

MALICIOUS

PDF

88.3 KB Created: 2021-03-27 13:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 55f79d3490b17d4adec64bdffab4a7f4 SHA-1: 8378f3229186e5abd74acfc698394317726c4972 SHA-256: 8bf776738a622a1cdba71324fd5ae3bb0a166f42f78a85407a908df258808fd6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document body and embedded URLs suggest a lure related to technical manuals, directing users to potentially malicious websites. The presence of multiple external URIs and link farm heuristics indicates an attempt to redirect users to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://seumenha.ru/award?keyword=unifi+ap+ac+pro+manual+pdf PDF link annotation
    • http://gubuxuk.scienceontheweb.net/how_much_does_a_veterinary_assistant_make_uk.pdfIn PDF document text
    • http://raisinshub.club/kalugisuwojazitumuzozodunrxees.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458623/normal_602f14c21819f.pdfIn PDF document text
    • http://tehnikator.ru/85824922399lw6fn.pdfIn PDF document text
    • http://fikakutipid.mygamesonline.org/330i_zhp_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_604fc11ac89a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_605ef75c2829d.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/97045998.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/gghohhe/57130271417.pdfIn PDF document text
    • http://redita.fun/jitanizo9dwd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5fdd6210ce73d.pdfIn PDF document text
    • http://rm-swis-mine.com/gibavododijulokafel8ngox.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/fjdhcb7/korean_bbq_near_me_now.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/anthony_robbins_book_unlimited_power.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/ihiih09/5840074663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368479/normal_5ffeba6eabba6.pdfIn PDF document text
    • http://muzomabavima.medianewsonline.com/giroxutikegadugixusiguton.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/cPzxDtW/movie_theater_north_hollywood_ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://womawujun.atwebpages.com/eduardo_galeano_books.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_6f489a72440642d3b883d9636507beaa.pdf?index=trueIn PDF document text
    • http://fowakoleviwamop.onlinewebshop.net/29477031432.pdfIn PDF document text
    • http://moxixezegosa.onlinewebshop.net/ancient_history_questions_for_upsc_prelims.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_664d8a0441eb4012be0df32621df02de.pdf?index=trueIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_45ebf7a00eda4daf9358a18ed3bb414e.pdf?index=trueIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_78f038ed51944a97b0670dae7a354370.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
    • 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_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 5116 bytes
SHA-256: a8f15cbd253356a855c1eec800f3081eb3d68d2f6b4d353546900bc8d5973c1f
font_01_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 16024 bytes
SHA-256: b55d49d0f05c8c24634ce4c0a006e1e8e9a94358193e50e8246c35d4f1d10530
font_02_sfnt_off00013dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBD 16276 bytes
SHA-256: 463893d7d7c2a8252920114102de44de58baf4992764f1d9792c99c855a47308