Malicious PDF — malware analysis report

Static analysis result for SHA-256 5548b32430d66bab…

MALICIOUS

PDF

74.5 KB Created: 2021-02-15 02:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 79896d678c22430f10ad8010487d9c33 SHA-1: c4a70710cc476d33de101d4868ade61c068cb3f8 SHA-256: 5548b32430d66bab50703e4d49f2aad51733825d3dbd8d857054ae0ea27239b1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily corrupted, contains text related to 'wkhtmltopdf' and a date, suggesting it might be a generated document used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://crophysi.ru/wix?keyword=the+greatest+miracle+in+the+world+pdf+free In PDF document text
    • https://cdn.sqhk.co/mibajufaneja/jjPgfvY/towotawo.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/jjApzjg/galaxia_dental_el_paso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471948/normal_601bca7264ec2.pdfIn PDF document text
    • https://tojemiwavujiguv.weebly.com/uploads/1/3/4/4/134468879/pakonipulif_kilakifogij_soluwolisud.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/jf7OjdD/vizagod.pdfIn PDF document text
    • http://wordsideget.top/sulosupivusuxiwt5.pdfIn PDF document text
    • https://webakutukulufu.weebly.com/uploads/1/3/2/6/132683024/sanavugifil_nedudukuse_kofitu_zepup.pdfIn PDF document text
    • https://cdn.sqhk.co/duputokodoz/fhaIZqW/9236368970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5fd17275c53fe.pdfIn PDF document text
    • https://wupumemugate.weebly.com/uploads/1/3/1/4/131407036/girotapixitisosusima.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402252/normal_5fe07bc037884.pdfIn PDF document text
    • http://pubgucbayim.com/arealme_iq_2017_answersrcf2w.pdfIn PDF document text
    • http://timecodes.net/evidence_of_evolution_worksheet_middle_schoollofio.pdfIn PDF document text
    • https://cdn.sqhk.co/kezinujus/gWIigge/nfl_fantasy_football_rankings_2020.pdfIn PDF document text
    • http://trelon.fun/57860900826v1tbs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_601c78b6d5cda.pdfIn PDF document text
    • http://kleomaften.online/el_castillo_ambulante_libroxx2ow.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/O1Zwhco/glitter_wallpaper_iphone_xs_max.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dimonejoxu.rf.gd/cisco_aci_f5_deployment_guide.pdfIn PDF document text
    • http://wugupijejituzog.rf.gd/fx_991_es_plus_user_guide.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_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 5612 bytes
SHA-256: 4fa0690645f281f8288c82d2857465c654e9b82588270b6c8fd312a0a53de60e
font_01_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 10704 bytes
SHA-256: 388b095a9e8456fcc93489e83784747a993425dd26ef21563f3c7ae5944cb82d

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