Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53fc94fa9ddf1dc…

MALICIOUS

PDF

78.8 KB Created: 2021-03-16 15:09:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 22297a3cc7a0973bb381789a8ca03ddb SHA-1: b013ae231997aa8a335edc974e56fc94c39b8aef SHA-256: f53fc94fa9ddf1dcdfb694b4ef3f947e783475e1f4e19edf89bb1e325546b913
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('pelibifir.ru') that is likely used to host a phishing page or a second-stage payload. The PDF structure and embedded content suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://pelibifir.ru/strik?utm_term=scag+tiger+cat+2+52+vs+61 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406820/normal_5fe48cc297151.pdfIn PDF document text
    • http://50offit.pro/fiwunefajisilokabudexabim4tcnx.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/how_to_reset_dsc_neo_panel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459318/normal_5fca7ad06dad8.pdfIn PDF document text
    • http://coolvdomaion.online/what_are_examples_of_suffix_nessrwal5.pdfIn PDF document text
    • http://redirunna.xyz/sajafixexadixonofomatafuzjsi29.pdfIn PDF document text
    • http://tunabamilusi.mypressonline.com/polycythemia_causes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464313/normal_5ff3b90c54125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426416/normal_6038bd9e54141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fasudikek/sportdog_sdt00_transmitter_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/41256845284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9135c8-bc0e-419d-bc07-e4caba664181/how_to_bleed_craftsman_2_ton_floor_jack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997346af-6910-41a4-9807-75dff71db82e/66056934377.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/food_supply_chain_management.pdfIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/if_function_in_ms_excel.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/crossfit_wod_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9237d18-b2ee-4d05-8ecc-2fbb153b7e25/what_is_the_bolt_pattern_on_a_2019_honda_accord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0373cd77-55b1-43d1-8fea-8e1ecc4ee5d7/35941958236.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/que_es_comunicacion_digital_segun_autores.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/jajaniwulubovoligokaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d1857d-6b7d-4a2e-922a-0eb07671bc92/solid_state_physics_pillai_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063b0d52-fb5c-4ea1-9bcc-2517c8f4cf2b/is_iyengar_yoga_good_for_weight_loss.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_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 5560 bytes
SHA-256: 9c87c2e48a66d796a6af1b0bd514f364f830e0c4290779c4709f7ca6c1c4a869
font_01_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 10764 bytes
SHA-256: 2ccc3494807c5735855547dd7ccc951a5b71095a6ac3b834db7032bf09068440

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