Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ecaf392c4955e8…

MALICIOUS

PDF

90.2 KB Created: 2021-03-22 04:25:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cffb9b00d6fbbb39c29e22b07daf7f73 SHA-1: ae315fb85afad5b5c65b897257bd4b957b7b33e2 SHA-256: c5ecaf392c4955e80954edf9b8dd8cce62d5ac7d299b220f72e4144751dfad48
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, and one specific URL is formatted as a search query for a printer driver. This strongly suggests a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a campaign designed to trick users into downloading unwanted files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://resalured.ru/strik?utm_term=hp+laserjet+1100+printer+driver+windows+98 PDF link annotation
    • https://kepubewi.weebly.com/uploads/1/3/6/0/136095452/7567337.pdfIn PDF document text
    • https://mokazeke.weebly.com/uploads/1/3/1/3/131384082/nexer-niraboxazowage.pdfIn PDF document text
    • http://wutopezogegusi.getenjoyment.net/creative_writing_lessons_elementary.pdfIn PDF document text
    • http://mexawolin.medianewsonline.com/brahmastra_maths_book_ajay_gulati_download.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/9876491.pdfIn PDF document text
    • http://fixisotaj.22web.org/fovuwasowutiv.pdfIn PDF document text
    • https://japiravonasuv.weebly.com/uploads/1/3/4/6/134644749/04eb9b5c096.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_26f21f55f7bd4f2c82ac9f48219e3ef7.pdf?index=trueIn PDF document text
    • http://sonowodiguvab.epizy.com/certified_ethical_hacking.pdfIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_4962c1e2fd214480ac2ae9f9e2768099.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d4a91f6-c6ca-4036-b38a-4a4ca2a734ae/tadepo.pdfIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_54492d468cf24d6b99a8fbfebf3d8a53.pdf?index=trueIn PDF document text
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_8c32525c9f78488298db9623f598ccb3.pdf?index=trueIn PDF document text
    • http://kagubosewox.epizy.com/28286475950.pdfIn PDF document text
    • https://78fc25e8-d533-4ec3-a480-3617e8cc0d4b.filesusr.com/ugd/aa5866_c48a7b46fd8b492eb341689c99aa101a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1309886-f4a2-4ea4-84ef-8ddc7cb89995/70215337092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd032eb8-c0b2-411e-9ccd-6c191103a9e7/56748505398.pdfIn PDF document text
    • http://zusewijoje.epizy.com/tamil_hd_baby_video_songs_free.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_7e61761462f941bfb2e7cb3b25085029.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_f33dbcc81a7840cbb170807de78f0f67.pdf?index=trueIn PDF document text
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_d8c928d71aed4083ae322e0d511924a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97303740-df09-42e6-9a0f-1416042411f6/how_to_draw_a_realistic_dragon_flying.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_28964cb3f75d462285f3387bbcea0f1c.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_850caa18b1f64a1ebcdbbc9c0edcb527.pdf?index=trueIn 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_off00012274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12274 5684 bytes
SHA-256: 1db7182f7c34ac0442a2389fede83e2aed59d57dbb054ee64893e6a823a41319
font_01_sfnt_off000135eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EB 11028 bytes
SHA-256: 95ed323a2e03a6b7971666ef57f537fdd0ecc48e9d672dd8ef84e336cd74f7cc

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