Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a907353cfcaa63b…

MALICIOUS

PDF

67.3 KB Created: 2021-03-27 20:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4ba301f1505d5934a95a9cfc2edfced2 SHA-1: df28500af55bbe4e235e0328bc8e23153ae247ec SHA-256: 9a907353cfcaa63b5dca3a0105ad76a4a048928cbbcd895fc00be733cf16c501
254 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits critical heuristic firings for malicious redirector links and a link farm. The primary malicious URL identified is https://crophysi.ru/wix?keyword=boise+self+rescue+manual, which is likely used to redirect users to phishing or malware download sites. The PDF structure and embedded links suggest an attempt to disguise malicious content within seemingly legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=boise+self+rescue+manual In PDF document text
    • http://helpforteam.com/tv_cartoon_characters_60_s_70_sydleg.pdfIn PDF document text
    • http://dlkmvkoenv.info/the_forgotten_ways_hirschsawvx.pdfIn PDF document text
    • http://bhd-management.space/teorias_de_la_personalidad_fadiman_y_frager_descargarxonhp.pdfIn PDF document text
    • http://my-credit.info/mackie_profx8v2_8-channel_professional_fx_mixer_with_usb_reviewa61lm.pdfIn PDF document text
    • http://fruit-ita.fun/internal_combustion_engine_meaningkhpl8.pdfIn PDF document text
    • http://crysety.xyz/zazejerakazz3vi.pdfIn PDF document text
    • http://cmbespaceclient.xyz/666516061532cfwr.pdfIn PDF document text
    • http://lotsmen.com/clr_via_c7cvde.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_a7d86556009e4b4281e46ed40aa5032c.pdf?index=trueIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_a2ae6f5f29eb4ddf928dadb9b0f08587.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legesiliv/braun_electric_shaver_series_9_9290cc_black_friday.pdfIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_3ecc33b1e7b04714bcf5336d28725795.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dupula/tisudaduwowef.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/mailerlite_email_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/dismissal_letter_template_gross_misconduct.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_fcb027a489c64786806507970c2585fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/schumacher_xc103-ca_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/zobosenajekugewi.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/hearthstone_dalaran_heroic_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_off0000cc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0D 5076 bytes
SHA-256: 0024f612181a4b1ae8f07f6945c2634c66923ed28dd246f6928305ad63cc13f2
font_01_sfnt_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 10348 bytes
SHA-256: f324110b9c773665cd2782634c449ccb16dfc9e11cede21b061fb0ebd1bbfdcc

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