Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b65a3ec19954b20…

MALICIOUS

PDF

78.3 KB Created: 2021-03-29 03:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3a336617d4894448a83828a87972272b SHA-1: a92e7a20221be645102cd00a1cea782985d6c8c3 SHA-256: 1b65a3ec19954b2044c2fe204f7c55931f708d3227253f19648d341e10e0269a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of numerous links to disposable domains and suspicious URLs points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/strik?utm_term=safety+examples+in+a+sentences In PDF document text
    • https://cdn.sqhk.co/kizulajeli/njgQOPK/witasipagejid.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/lQghhc9/24263684577.pdfIn PDF document text
    • http://optamorem.com/download_head_soccer_laliga_2020_mod_apkk1i3w.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/48996441714.pdfIn PDF document text
    • http://small-italy.space/576619928759m5lg.pdfIn PDF document text
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/f6e956225cf1.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/working_of_tunnel_boring_machine.pdfIn PDF document text
    • http://wersita.space/yamaha_ef3000iseb_generator_specsxk42a.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/what_does_skull_emoji_mean3plvj.pdfIn PDF document text
    • http://begemotiks.space/salosoj366h0.pdfIn PDF document text
    • http://marketitaly.info/aafat_wapas_song_320kbpsqmweb.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://ligapixoxos.weebly.com/uploads/1/3/4/3/134378271/fejefu_lanivijadif.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/what_is_the_best_stationary_exercise_bike.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/M4Sidmd/kedopewetaritiboneweb.pdfIn PDF document text
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/pisulizivikof.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/qgiYpid/radio_online_free_usa.pdfIn PDF document text
    • http://copyrightram.net/364792116410f6zq.pdfIn PDF document text
    • https://cdn.sqhk.co/tedogegez/gjedQja/gosiwewoforemuwoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_077331d2c41541c3aac51ace6d773d73.pdf?index=trueIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_7f359553224d4dd3825a1a2cf1154d66.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_0d183edade1647bc955c86fc0d675bf3.pdf?index=trueIn PDF document text
    • https://7fd4abad-31f8-4c52-ae8e-93d0cc7f2af2.filesusr.com/ugd/910e70_059adcae50fe47dca8df803a88604a3f.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_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 5336 bytes
SHA-256: 88b392b65f382b86cdcfb4f8cef6d221f51fe69a6caf8d354bf6582cabfc78b0
font_01_sfnt_off0001040f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 11172 bytes
SHA-256: 910c2813265232fd609bf731d00c9d550d36675503998222674b932b82f70e10