Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7e2c2bfec18209…

MALICIOUS

PDF

74.1 KB Created: 2021-01-16 10:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 49a924fccbb5aa85b9b7f7a167d6b5b4 SHA-1: 8e12c56f7fc05f085462ec1f27b7876b2cabc85b SHA-256: 9d7e2c2bfec182097c74249b360b9fce37adb6e738e429d222e477b5f4a211f2
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The presence of these links suggests the document is designed to lure users to external sites, likely for phishing or malware distribution.

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.
  • 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.
  • 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://cctraff.ru/123?utm_term=vickie+4+in+1+crib In PDF document text
    • https://cdn.sqhk.co/vijukifezu/ghpsyif/minujag.pdfIn PDF document text
    • https://site-1171899.mozfiles.com/files/1171899/alien_zone_raid_mod_apk_unlimited_money.pdfIn PDF document text
    • https://site-1175608.mozfiles.com/files/1175608/58396642179.pdfIn PDF document text
    • https://site-1166051.mozfiles.com/files/1166051/inner_ear_infection_symptoms_in_toddlers.pdfIn PDF document text
    • https://site-1174531.mozfiles.com/files/1174531/wofojedagigipobibubapug.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/sokurinom.pdfIn PDF document text
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/rexuvunejofi_gimebuzibeneja_sovujaki_nekazomep.pdfIn PDF document text
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/zutorefogolujak-gumutogaxapa-putogofoluvo.pdfIn PDF document text
    • https://site-1178831.mozfiles.com/files/1178831/ios_storekit_download.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/gixawetopoli/sodawosevowewa.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_off0000e64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 4684 bytes
SHA-256: b78600b2594a65f268f6c1f1972f539d91c6c27e26bb10ef0447cd04b792c588
font_01_sfnt_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 10988 bytes
SHA-256: 371d2320beeaabb4dc5386f2a6b9f6179c89d0cfc8944afaf78c4c4c91f5a200

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