Malicious PDF — malware analysis report

Static analysis result for SHA-256 754533aa620d6306…

MALICIOUS

PDF

73.1 KB Created: 2021-03-15 16:58:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a9506dad990b058ffafa95165f571e2b SHA-1: cab7e1c29c197ee765f31b8f499501a6a35a5197 SHA-256: 754533aa620d630630ab3cb8d670f7f7bfde1dff5b79f9da84cdae006e5dfa38
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The presence of a visual download button and the ML classifier's high confidence score further support malicious intent. The document likely serves as a lure to download a second-stage payload, potentially exploiting a client execution vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/123?utm_term=driver+bixolon+srp+350+plus+ii In PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/bjaMifL/skins_para_virtual_droid_2_url.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/g6haCul/star_wars_card_trader_by_topps.pdfIn PDF document text
    • https://cdn.sqhk.co/fesoxuleri/WiBjdhi/sakudoba.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/wUbhij2/seven_sisters_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/jcmGDja/wujuvitifikoxezarujojev.pdfIn PDF document text
    • http://sakabeg.iblogger.org/rafatimasilonepeziko.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/dtggg3O/fabatitunatotaletoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_691c5ff83ebf42698f9c975111961918.pdf?index=trueIn PDF document text
    • http://romisov.epizy.com/lapijodekijewax.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_67dd1bb322454f2f901d68e07f52c045.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/wexaniwagaxufupuxoton.pdfIn PDF document text
    • http://tupaguwojisese.rf.gd/35024439203.pdfIn PDF document text
    • http://bibalaluroxute.epizy.com/44816601035.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_dad7d664f768422faae55fb7793acca3.pdf?index=trueIn PDF document text
    • http://vomifavub.epizy.com/guided_reading_activities_year_1_twinkl.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/66003527944.pdfIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_5b687f3c30744ae7844bb33a998a02e7.pdf?index=trueIn PDF document text
    • http://joxelugokolutu.rf.gd/holden_barina_2006_owners_manual.pdfIn PDF document text
    • http://kozusabupo.epizy.com/rosopagod.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_d68c1f25cadc4b0fa0f4272c0d4b67cc.pdf?index=trueIn PDF document text
    • http://gidevobagore.rf.gd/latesalaxekotolif.pdfIn PDF document text
    • http://lizaduguxo.epizy.com/tedawojixovesunolovubevap.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/tifuporoviz.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_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 5300 bytes
SHA-256: 2820ec76479edd301b317f1f898631b215d98303a5cf3f9fc226f330cf390932
font_01_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 11612 bytes
SHA-256: 8a01def25efa40ef9182318baa81c6872d50184f846abd836d4f4d96c8a32d45

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