Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f16d77b9ce6f53…

MALICIOUS

PDF

82.1 KB Created: 2021-05-18 05:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2c4cf3bc1237396c563e6c7c6602b2a2 SHA-1: c4c52ad590bc27539d9c4002ec495a5d89d079cc SHA-256: f4f16d77b9ce6f53ab34dacc9f17d9a5c43f6e51750a1562c41be918426f5948
204 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure, indicated by the presence of a large number of external links, many of which are SEO-optimized and redirect to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent. The file likely attempts to trick users into clicking links that lead to credential harvesting pages or second-stage malware downloads.

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://fokemale.ru/strik?utm_term=t-shirt+printing+company+profile+pdf PDF link annotation
    • https://xixiduduge.weebly.com/uploads/1/3/4/7/134713202/fezis.pdfIn PDF document text
    • https://zezazerin.weebly.com/uploads/1/3/1/8/131856191/xepabewuvofa_nawurej_nafasobogu.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/545bceae-022a-4e00-993e-bd53b3c5831e/how_to_pack_a_shoebox_for_shipping.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/84289954045.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/samsung_hw-f550_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6cfb365-90cc-49ac-8a4e-45f4cc3c9216/zalurepate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3f70942-4410-4c8b-8ec3-1a20c7207df7/28041509805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2600323f-4aa7-44e9-885b-b0c24b32bff0/kero_sun_omni_105_kerosene_heater_wick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a146b6cd-a01b-4caf-aae4-9eed0677d0b1/hansel_and_gretel_story_with_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/bosch_colt_router_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d44c3d-930d-4217-8a3a-a16b92cd120b/roletipatewalutupagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/815353ae-8520-4247-8949-880007db304f/wodibejugug.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/cronista_dolar_informal.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/google_material_design_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a43b939-8fcb-4249-bffc-3fd3037642cc/how_to_use_a_bosch_brute_jackhammer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156e4ff5-986a-49bb-a568-ac4a4078d8e2/vexone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf1cec3-4b32-4a11-878a-1bec6f5c1f85/daviss_drug_guide_for_nurses_book_by_judith_hopfer_deglin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34dfbb8e-cfcd-47e6-bbfb-0178863a73a9/microsoft_wireless_mobile_mouse_5000_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7305246e-e396-4370-92f5-515949c68f0c/singapore_math_workbook_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f91843be-d52f-40de-b0f1-8fdd2dedc7ec/russian_alphabet_sounds.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_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 5652 bytes
SHA-256: a200e396f9d9142718f21fed564c3b446b3134b1db01d505efba49c1069ab273
font_01_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 10908 bytes
SHA-256: d0c909b1c828e9e58c5437a5420630e9a66151e425267515cac138876412fdc6