Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d3d1f192920bbe…

MALICIOUS

PDF

75.2 KB Created: 2021-03-21 07:13:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c609074a9d4c9f81b1c1f2da06924e98 SHA-1: 8189958d6092519088fb3853537af2897ca9488b SHA-256: 36d3d1f192920bbe63715bf011ea088acb9e9cbb696cdbe4a935c0c641fec2d4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/strik?utm_term=panasonic+phone+block+caller+list PDF link annotation
    • https://tiriwubesunadew.weebly.com/uploads/1/3/0/7/130739346/f4c47.pdfIn PDF document text
    • http://badge-verification-center.com/vamodabivowazeguvivujijojo6q95.pdfIn PDF document text
    • http://lorenbayi.com/mivavuledasafimuvimevubujsxzwu.pdfIn PDF document text
    • https://filuloxi.weebly.com/uploads/1/3/2/7/132740414/xukaveximu-lavawiku-mokafe-nokaxasetomaza.pdfIn PDF document text
    • http://katipef.medianewsonline.com/printable_2020_nascar_schedule.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/naxiwutomakin-libudesugazo.pdfIn PDF document text
    • http://copyright-rules-help.com/what_snacks_can_you_have_on_the_10_day_green_smoothie_cleansez3d4a.pdfIn PDF document text
    • http://yozi.store/list_of_invention_and_inventorsdw23o.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/artemis_fowl_opal_deception_graphic_novel.pdfIn PDF document text
    • https://sivitudogadix.weebly.com/uploads/1/3/4/1/134108631/2901be76819d.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/shakespeare_sonnet_116_literary_devices.pdfIn PDF document text
    • http://service-hire.com/motivational_interviewing_training_seattle_2020bivp1.pdfIn PDF document text
    • https://nuvomananakoleg.weebly.com/uploads/1/3/1/4/131453817/2031004.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/7ad49c57-8469-40fe-806a-9308bad242d1/17085196469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3177abae-d67b-4a90-968c-c42779bbca8a/pipijisuwoguxadule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e780045b-9cfe-4d56-9318-70bb8cd2a792/movofete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6494d675-bce9-4724-a937-e04d7fb5c213/sony_vegas_12_serial_number_and_activation_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0d418b-884e-4cec-a5ca-886a022b7b71/61034040726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07e7b7a-87e2-422d-b67f-7c64e9952706/orbit_sprinkler_controller_manual_27894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1275207a-c6a7-4b39-bb02-c16021beb777/how_to_not_be_the_smartest_person_in_the_room.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dcd2c8b-f908-4b83-be93-9da24af8c72b/bissell_spot_clean_pro_pet_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ae4316-b59a-4dd1-9b6e-182ba76a6041/zakujudaxitelom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3003513-cc11-4b4b-8bfb-f47c8e479d2a/mean_median_mode_worksheets_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4bffd5-d9c9-43ef-843a-019bb7408b58/1480568381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b44518-3704-4edc-946f-4253ebf67271/kotenasudusajavutiwumurab.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_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 5224 bytes
SHA-256: e6e355fc113db96c5c8fc8b05e969abf4a0e66a53f234d433a924ba0f99bb657
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 10816 bytes
SHA-256: 15d4834bbb335c4f7c5777bc70d17a615ca5e9d1aea786ed936b0f132397d1b0