Malicious PDF — malware analysis report

Static analysis result for SHA-256 589c7f1390b58cf2…

MALICIOUS

PDF

76.3 KB Created: 2021-03-04 17:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 43bf8c13123c8084df0d7f5d08581b63 SHA-1: d139fa2303797aea5d6b9e58d2a7400f2f6ba31d SHA-256: 589c7f1390b58cf2dfce30ae3e4cdf9aa2d10e8c7013abe6b3c6e5cfd08256bd
226 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, many hosted on disposable domains, suggesting a phishing or SEO spam campaign. The heuristic 'SE_MFA_LURE' indicates the document is designed to harvest credentials or abuse multi-factor authentication. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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/award?keyword=how+do+i+reset+my+radio+thermostat PDF link annotation
    • http://dosaxixapaxa.medianewsonline.com/wugewetojejakimi.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/Sjcijhj/67720797521.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwufeguv/hcdiaia/teddy_roosevelt_accomplishments.pdfIn PDF document text
    • https://bosizeke.weebly.com/uploads/1/3/4/5/134596703/famifowubapelev-tizat-juvafijo.pdfIn PDF document text
    • https://ziripovamenof.weebly.com/uploads/1/3/4/6/134647136/8985734ad95425.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/GZgcjiS/project_management_software_free_gantt.pdfIn PDF document text
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/be89d83907.pdfIn PDF document text
    • https://kopomitesukov.weebly.com/uploads/1/3/1/4/131453216/4322233.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/what_is_the_spirit_of_laws_by_montesquieu.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/hahbFjg/tifovovo.pdfIn PDF document text
    • https://cdn.sqhk.co/wemowubire/mtBhfgd/world_war_two_minecraft_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d0a9874-41b1-4295-9d2a-63009b572779/tx-nr636_bluetooth_pairing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c0f020a-d53e-4474-9370-73f144359e19/mtd_lawn_mower_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ca7328-ac5a-491f-9408-e76ec99c11dd/54504348538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90082478-d4c0-4e3a-b9ef-9ac2f6a8c19f/54855942285.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/tosafimufupezitakinuxolod.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/re_zero_light_novel_volume_15_epub.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_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 5188 bytes
SHA-256: b7fd9fa458e9835ee3561c7c6686056f44c4648b2ba8c62b98dc47c3eb7929fd
font_01_sfnt_off00010135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 10264 bytes
SHA-256: 2cab103af2b9aa8a9da571d03fa1ea60d740038813a2ea915fec7e79d138c74a

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