Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b2a2545f671f1a…

MALICIOUS

PDF

82.5 KB Created: 2021-03-17 20:32:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a1cf3d46f7586bc102691f6f72742858 SHA-1: b2870751b88a6fad9845a91a2cbd8fb1ab626ab1 SHA-256: 94b2a2545f671f1a962655ca884dd4e2dfc7dbc753b05155cff62d79ba8e740f
254 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are identified as redirectors or part of link farms, suggesting a phishing or malware distribution scheme. The heuristic firings indicate the presence of malicious redirector links and a large number of external links designed to mimic SEO content. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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 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://yafferge.ru/strik?utm_term=will+cyberpunk+be+on+xbox+one+x In PDF document text
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/ronude-nexelofit.pdfIn PDF document text
    • http://tubatil.iblogger.org/adware_anti_spyware_free.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/viwonulugo.pdfIn PDF document text
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/rizetimute.pdfIn PDF document text
    • https://gixoloxivut.weebly.com/uploads/1/3/4/0/134040336/warajo.pdfIn PDF document text
    • https://podotetu.weebly.com/uploads/1/3/4/0/134017986/jevitufafotimeneber.pdfIn PDF document text
    • https://nunevebola.weebly.com/uploads/1/3/4/8/134846747/daxadowozifoxenuto.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/zogudogixe.pdfIn PDF document text
    • https://wesuzekubiw.weebly.com/uploads/1/3/1/6/131607103/96c4445b39dd688.pdfIn PDF document text
    • https://zupelewelasilag.weebly.com/uploads/1/3/4/5/134594614/33257ff0787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vipukexevuwe.epizy.com/simple_compound_and_complex_sentences_worksheet_year_5.pdfIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_7d069ff855694f0e8c1f557b1d9b4e4e.pdf?index=trueIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_8b905e0e6a7848269ab030f912cfd3fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/antivirus_with_key_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/litixapowivumotemula.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/snaptube_update_version_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/texipexetewakaxilure.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/nowej.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/45716385516.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/33733028799.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/tuloxufukitunefujekenubo.pdfIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_a20a4fa8440d418ca662e64b419f2d1f.pdf?index=trueIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_2e7d4768a66c4cff90a82b4c5d7c96ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bivanud/android_bootloader_driver_windows_10.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_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 4928 bytes
SHA-256: 066dbc9fc9595f68f8297166034af507ef21373e5c6fb61026a8f0810035a2d1
font_01_sfnt_off0001163c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163C 11260 bytes
SHA-256: adc0ad88c3a5b758dfa7ac41cd503f2078438292d2caf88d4a7bcb5d14351c8e

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