Malicious PDF — malware analysis report

Static analysis result for SHA-256 341c913f0f6f7500…

MALICIOUS

PDF

83.1 KB Created: 2021-03-19 23:16:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 354b5450fbb7e3f561fd48d4b457d5cf SHA-1: b6c92b7134d92e0cc58a319e7ab7cfc021e8a262 SHA-256: 341c913f0f6f750023abf015549bdd5c769ead8c203ea421b14c9507f3ecfec7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically classified as Pdf.Phishing.Trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the redirection behavior. While no scripts were explicitly extracted, the nature of the PDF and its link farm suggest it's used to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=bernina+1230+price PDF link annotation
    • https://sitofozaliwi.weebly.com/uploads/1/3/4/3/134355749/61865.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5feb8f1e8499a.pdfIn PDF document text
    • http://scandisvet.ru/can_u_get_walmart_black_friday_deals_online5el7i.pdfIn PDF document text
    • https://ledimame.weebly.com/uploads/1/3/5/3/135306483/68a62.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/sodejifefuke.pdfIn PDF document text
    • https://kazamudadi.weebly.com/uploads/1/3/0/7/130775411/3383756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_603a866735c57.pdfIn PDF document text
    • http://ukranews.site/26071266290i6fxl.pdfIn PDF document text
    • http://wide-mean.top/swami_sarvagananda_free_mp3_downloadribj9.pdfIn PDF document text
    • http://kapusta.pro/papafobagotojahc5t5.pdfIn PDF document text
    • http://retys.space/download_game_crowd_clash_moduck9p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/89d2c64b-7642-4cb5-99a6-1b999aa5f28b/44176152012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee78983-2c1b-4e28-bfa0-22f0db705efb/dell_latitude_e6410_i7_windows_7_pro_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f546ef-697b-461b-8099-80a624902185/whitfield_pellet_stove_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11580fd9-7abe-4619-9e5d-1d84cf9af127/planificacion_estrategica_tactica_y_operativa.pdfIn PDF document text
    • http://rudupunijosapiw.rf.gd/nebuligemaboluveguvipasu.pdfIn PDF document text
    • http://nofufofivazogi.epizy.com/navodaya_vidyalaya_5th_class_admission_form_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e50b96-c360-45fd-8678-a3084b887751/onkyo_ht-r340_remote_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f548b8-8343-457a-9eed-f037825f3361/xumapevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38e2cbf7-6916-4f8a-9dcf-855ce5eb37a6/wusisasigaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d3fb0a-2a57-4c52-8122-281fc5059ec1/libro_de_calculo_diferencial_e_integral_conamat.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 2952 bytes
SHA-256: 013fc9f45313cdddd5762e6694753e55f6a85ad2eec225b6e17fd140af1ee5c7
font_01_sfnt_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 4856 bytes
SHA-256: 3302c06cfe8ec38c44f972db4e6140924f863bd1d8d7645169966fc6d8a1d7bb
font_02_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 11432 bytes
SHA-256: 3f84fe41b3e47b24a14fb80e046a6f354a2c901f14ed43c8877300d6fe09800a
font_03_sfnt_off0001301f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176