Malicious PDF — malware analysis report

Static analysis result for SHA-256 a507b21f328d4449…

MALICIOUS

PDF

69.7 KB Created: 2021-02-18 20:11:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8977b55324cda2461baafc8feeb55672 SHA-1: aee8c822c73b195257ea8e55be2653e942d17165 SHA-256: a507b21f328d44495208ab624583c17f7430a499d35736651c9a25e14a7005f5
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically identified as a phishing lure related to job interviews. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish credentials. No scripts were extracted, but the presence of malicious redirector links is a high-confidence indicator of a phishing attack.

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.
  • 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=how+many+rounds+in+wipro+bpo+interview In PDF document text
    • http://boomerangoo.site/10289966231f9s8n.pdfIn PDF document text
    • http://prizyivnik.ru/davis_drug_guide_app_login1hatv.pdfIn PDF document text
    • http://solavopuna.22web.org/vakejagajaxovuzubo.pdfIn PDF document text
    • http://my-favshopc.online/catalogo_ikea_espaagsrfa.pdfIn PDF document text
    • http://fullstacket.online/71206303172mfml6.pdfIn PDF document text
    • http://pek-24.cc/dulofuviz9biv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xujitezu/busy_busy_song_video_likewap.pdfIn PDF document text
    • http://roniwixanedif.epizy.com/google_sheets_if_cell_contains_text.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/halloween_invitation_templates_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/neroxozo.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/sarcoidosis_pathology_report.pdfIn PDF document text
    • http://sajekitix.rf.gd/dawopagupomolekasebex.pdfIn PDF document text
    • http://wagadepepixapu.epizy.com/76581114013.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/zekisawabutadijuwagid.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/78412662068.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD315 5428 bytes
SHA-256: 61e5678fe0cdd20de1a636723d03fb6309bc9867c7d9af6bd51c204a1a6eb845
font_01_sfnt_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 10876 bytes
SHA-256: 4d61e0db9d866b748fa0850a2886deeed4c6b0892bd7e5b7ebaf979aca70dced

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