Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7531fb5459d4bdc…

MALICIOUS

PDF

80.1 KB Created: 2021-03-19 11:10:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e6094d3087a54afe92d8cf7a1c9d1ed7 SHA-1: 98d4e4274f00d333be46b470bdc1f93bf3144b30 SHA-256: d7531fb5459d4bdc08188fa9651cfa78315877d60e4399b62200cd389bb66a2e
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an "enable content/editing" lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://botokaw.ru/123?utm_term=certificacion+laboral+teleperformance PDF link annotation
    • https://cdn.sqhk.co/jivomawufem/hdJXw9S/business_indonesia_magazine.pdfIn PDF document text
    • https://cdn.sqhk.co/xubenijevewe/5r5Qics/58090702747.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/what_causes_permanent_acid_reflux.pdfIn PDF document text
    • http://newobesarejif.22web.org/14449982057.pdfIn PDF document text
    • https://wotowabe.weebly.com/uploads/1/3/4/6/134688823/228ceac11.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/xarusikinevabelamadasexul.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/hgggq7J/cowboy_bebop_vinyl_mondo.pdfIn PDF document text
    • https://kixorixoti.weebly.com/uploads/1/3/0/7/130740187/965a6fc10cfd37.pdfIn PDF document text
    • https://cdn.sqhk.co/zokoxirinuz/bghDfic/diy_carnival_ring_toss_game.pdfIn PDF document text
    • https://labadejasif.weebly.com/uploads/1/3/4/7/134718281/6915194.pdfIn PDF document text
    • https://waxukazo.weebly.com/uploads/1/3/1/0/131071095/nebabawus_ranaxizutixomag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://penanaras.myartsonline.com/vowawerufasizuzibuse.pdfIn PDF document text
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_4e49b1c6cf274ab59e6b7c24bccaefbd.pdf?index=trueIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_b2df46af04ea4f7697caea4a773d5a59.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_a5513676eafa4e8f9d419d80db632e20.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_80098d109c21419fa7677b41862c395a.pdf?index=trueIn PDF document text
    • http://fifusudevop.rf.gd/fussball_manager_14_ea.pdfIn PDF document text
    • http://kawuduzan.rf.gd/karuppasamy_kuthagaikarar_songs_video.pdfIn PDF document text
    • http://wusudafatuzawe.epizy.com/47668650028.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_3fabd8cdc5404e2b806ed3b53bd58fd1.pdf?index=trueIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_2eeedb9eaab847989a5f834e18969c4f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 5028 bytes
SHA-256: d5d991c56d683960892aed0247dad458509b949b04142bb7737ce15912ed3e51
font_01_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 12196 bytes
SHA-256: 9741298e0ee97108ec6343ed8ad50fa36abf2a317ad79e0e7e45f0485fc748c7