Malicious PDF — malware analysis report

Static analysis result for SHA-256 e857f591ab8a2712…

MALICIOUS

PDF

71.2 KB Created: 2021-02-25 17:00:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0d42c15fa819d407def78b959eded629 SHA-1: 26474db9dcae559262be2ab516984dea1d1c1ba0 SHA-256: e857f591ab8a27125205e22dc0061a9845d7f644fa2b0e99288ae4b58a44c560
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to S3 buckets and Weebly subdomains, suggesting a link farm or distribution network. The heuristic 'SE_LOLBIN_RUN_COMMAND' and the presence of URLs like 'full_form_of_cmd_in_windows.pdf' indicate an attempt to disguise malicious commands or content. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent, likely involving phishing or the delivery of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://maypoin.ru/strik?utm_term=perimeter+of+composite+shapes+worksheet+pdf PDF link annotation
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/2225d0dface8.pdfIn PDF document text
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/3f007.pdfIn PDF document text
    • https://kanudepu.weebly.com/uploads/1/3/2/7/132740929/takus_timun.pdfIn PDF document text
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/sebokazoniwiti_periw_daxakakoj_ratavijigebuzuv.pdfIn PDF document text
    • https://notovozeje.weebly.com/uploads/1/3/1/3/131379031/4171f705c087.pdfIn PDF document text
    • https://kanudepu.weebly.com/uploads/1/3/2In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/95242086952.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/jaxosu.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/wabipekomagoxarurogu.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/56382754418.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/full_form_of_cmd_in_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/kharedi_khat_agreement_format_in_marathi.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/zabejuvijolu/the_unbearable_lightness_of_being_best_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/faleton.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/juvuzoverorovumep.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/paypal_invoice_terms_and_conditions_template.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/xoboxaduvolovominoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/image_slideshow_powerpoint_template.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_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 5520 bytes
SHA-256: e08b4b8a7af84657eb9767e2dbe6f00c14715523bb7064ab749c78490adc697b
font_01_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 10336 bytes
SHA-256: c187a757b9f58110659512576b446979597067c8e4d5d37624ce75ef9b24e51d

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