Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c64518039fdadff…

MALICIOUS

PDF

77.9 KB Created: 2021-06-13 02:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 85492c40a2b658a815ab637947222890 SHA-1: c65bbaf9eab0d9fcc54bb96f10bd7d9766b1d167 SHA-256: 5c64518039fdadfffa65f31d839cb578a9c76809d0bd39e3da1202a91cd792d7
136 Risk Score

Malware Insights

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

The PDF file contains a high-severity heuristic indicating it's an SEO redirector link, disguised as a free download lure. This link, https://philabc.ru/pbw?utm_term=tenshintai+accessory+brave+souls, is the primary indicator of malicious intent. While no scripts were explicitly extracted, the PDF structure and the nature of the redirector suggest an attempt to lead the user to a phishing or malware distribution site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://philabc.ru/pbw?utm_term=tenshintai+accessory+brave+souls PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403541/normal_60c3ca99bae92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412775/normal_602a431a831bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_60bdf10f110af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_6018148ef2fc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_605ee43ea2647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_5fe927153833a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_6014c99693c8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/144476226/pulifeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aacdae6-390f-48c7-afd2-ef7fffb69be4/xalomasimonovepedata.pdfIn PDF document text
    • http://pobonagul.pbworks.com/w/file/fetch/144895239/demofowukipimugiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf7f544-1823-4465-886c-123a7978b88f/boredodojarevabavilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a36a67-796d-4217-b0a7-acd81395d2e4/how_much_does_an_electrical_engineer_earn_in_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc68dcd4-41ee-40ca-93c6-c3d5e950debc/32272634205.pdfIn PDF document text
    • http://diruzonedod.pbworks.com/f/vulunotofukaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72ea5b7-eaa6-4ba6-ab3f-ddce6ff3df86/can_you_charge_a_ps_vita_with_usb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8420387c-8fb5-4125-aab0-87267e793f83/actividades_de_motora_gruesa_para_preescolar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a6c021-fec0-4346-96e5-85485c37ba48/84878953623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7b9622-b0a3-4445-8824-812b5b7d5cc4/honeywell_programmable_light_switch_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb8756de-9ef9-4979-8c8a-b5fa18ca381a/dyson_dc23_motorhead_price.pdfIn PDF document text
    • http://litorabi.pbworks.com/w/file/fetch/144514026/aashto_roadway_lighting_design_guide_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d64306e9-4e46-44de-ae28-1ec39303ad1c/wewizususe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 5136 bytes
SHA-256: 8060cbad0c23a5020d4e95a5fcb3bb59def681ae4b95d19d066bafd42d81aad6
font_01_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 11276 bytes
SHA-256: 9bcd46db97ae9c008fa9da59a5b9b401d1075ae3a65c3fb2c34dc286ddfb94b4
font_02_sfnt_off00011548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2