Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da3ce637eda8198…

MALICIOUS

PDF

73.1 KB Created: 2021-03-04 03:37:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8f8abc4a353cbf37273b8a4060e25c88 SHA-1: 89abe5c6c25fce1e2cf3406b8ff9ac9a030969aa SHA-256: 6da3ce637eda819863940c6c2ca39f792eb9f2ab9318c595781cbd290dc5e806
186 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous external URIs, with one notable URL being `https://vilenefex.ru/wix?keyword=flappy+bird+apkhere`. The document body is heavily obfuscated, but the presence of link farm heuristics suggests the primary purpose is to redirect users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/wix?keyword=flappy+bird+apkhere PDF link annotation
    • https://benefirezunaxo.weebly.com/uploads/1/3/4/8/134864331/dujotewogudok.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/iaHVlhb/24820143150.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/how_to_get_a_unique_student_identifier_number.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/98359417495.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/hhcOidm/gps_maps_navigate_traffic_area_calculation.pdfIn PDF document text
    • http://sovuradema.medianewsonline.com/online_booking_software_ratings.pdfIn PDF document text
    • http://jarevine.mywebcommunity.org/tisazifuzonujiw.pdfIn PDF document text
    • https://cdn.sqhk.co/wukufazujuv/dZhfzjj/dark_sword_2_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/b7nYsfA/pogerulibimilorokuvip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/bandolero_cartoon_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/tugedejiletidujawifena.pdfIn PDF document text
    • http://nabapuxamiluj.epizy.com/51989582829.pdfIn PDF document text
    • http://joboberunora.rf.gd/47620997963.pdfIn PDF document text
    • http://vozovowu.rf.gd/ninja_blender_potato_soup_recipes.pdfIn PDF document text
    • http://sigedasubaduvep.rf.gd/tekken_3_game_apunkagames.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/1132993455.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_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 5128 bytes
SHA-256: d44ee4c5e40b7a16f03bfdf924ef7ad2077b23e5c1c6f83b1ef492c0e9d19dfc
font_01_sfnt_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 10844 bytes
SHA-256: fe6e1ed8e1f11959b0adac5564adca79776b7387fe217a285d8431cf3fc552ff

Open this report in the interactive analyzer, or submit your own file for analysis.