Malicious PDF — malware analysis report

Static analysis result for SHA-256 f401ceb5115be4e1…

MALICIOUS

PDF

77.9 KB Created: 2021-04-06 05:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cc273c4e66eee2dfafd46a46cb66b7a5 SHA-1: 114f16cd167db4dc66d3020b449a32f7cd18ce71 SHA-256: f401ceb5115be4e1ff78d054036fbbd0a9ec38f6742867a37cb0e5a2cfcf8b2a
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external URLs, with one prominent URL being `https://gimoguvi.ru/strik?utm_term=harry+potter+prequel+tv+show`. This URL is likely part of a phishing or malicious redirection scheme, aiming to exploit user interest in topics like 'harry potter prequel tv show'. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=harry+potter+prequel+tv+show PDF link annotation
    • http://kiritisivasol.mywebcommunity.org/68346773337.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/navy_writing_desk_with_drawers.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/how_to_remove_grohe_faucet_cartridge.pdfIn PDF document text
    • http://iblack.space/rakuxufafenilukazavobotdmoep.pdfIn PDF document text
    • http://coolmag.biz/bimibolulejerubukelopecxc5.pdfIn PDF document text
    • http://topfrag.rip/fedanuv6nkfj.pdfIn PDF document text
    • http://bogplaktnc.fun/motorola_android_one_visionxyo48.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/apokryphe_evangelien.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/9716c893-3758-449a-beee-3e6c9832b3f9/how_to_heal_a_pimple_thats_under_the_skin.pdfIn PDF document text
    • http://domuromu.atwebpages.com/university_of_maryland_electrical_engineering_phd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1542b7f-da4b-48f1-978d-791d36e42b83/texas_instruments_ba_ii_plus_professional_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5897a5cd-2994-4c68-a96e-044aeabe9583/mental_status_examination_powerpoint.pdfIn PDF document text
    • http://zaduzos.myartsonline.com/top_10_numerology_books_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/lixodajusijijur.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/38452550488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/171bae2d-525f-463f-b440-9913ecc654fb/komesakusixejijolasaja.pdfIn PDF document text
    • http://xadilopavut.myartsonline.com/25291340886.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/how_to_reduce_your_hemoglobin_a1c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b608c51c-7537-4762-94b3-ae2ed66d4240/subway_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64cd4556-3200-4c74-9efb-401350ab7340/high_rise_building_construction_safety_checklist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/387eebd9-a5cb-4033-8f55-5c460a9cac9a/gosomazegur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57842b00-3795-4396-90d6-f045e496a622/69663260460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb77e2a-dfb2-4366-9ea1-af785c7ec5ae/diary_of_a_wimpy_kid_dog_days_trailer_2012.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_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 5248 bytes
SHA-256: 3a9f1b239db0d229cadd6301009babe3c79c8e41a416b42cbe4b9b35a4998b9d
font_01_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 11384 bytes
SHA-256: a9199fd9d2e03eec34e7e2bc91f489634a3048f3e0c47d55c2613ab8009b0dcd