Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e4ec5368dda5ec…

MALICIOUS

PDF

70.9 KB Created: 2021-02-19 10:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d578d928de63660a31c52739563f9ceb SHA-1: 054ccde2f4aef65a0158a59701c76ece8b793558 SHA-256: d6e4ec5368dda5ec3997ac2fef64ed6000272deed02e00c5af6ae9c2a6e62084
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to sorting pivot table data, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/123?utm_term=how+do+you+sort+data+in+a+pivot+table In PDF document text
    • https://cdn.sqhk.co/sisalubitot/kidCghx/78518449511.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491934/normal_5fcc8e7f5af32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_6028fa74b70fd.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/jigcThf/67948473576.pdfIn PDF document text
    • http://xakojudanek.66ghz.com/letter_h_preschool_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/fijNrha/stickman_annihilation_2_mod_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_601b44407d571.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/ic2ghgH/occupational_therapy_assistant_schools_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377924/normal_5ffc7fed1d756.pdfIn PDF document text
    • https://cdn.sqhk.co/nibijegun/aXjftgh/22270823030.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikidexawudipox.epizy.com/15830327832.pdfIn PDF document text
    • http://tawegimasozaj.epizy.com/abdul_karim_khan_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/scheer_platform_pipeline.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/mathrubhumi_calendar_2018_june.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/tepuduxemifonugo.pdfIn PDF document text
    • http://momobolabewonu.epizy.com/high_anorectal_malformation_radiology.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_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 5308 bytes
SHA-256: 8fb0856853d7f95029f58f7a7c8095b903bbd5e95a4908d57bb6c7d4a759615e
font_01_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 10048 bytes
SHA-256: 64d8ac89d4529bc517591dec1d0b655e1c70e04879e0b6aab624c47fc1f3dcdc

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