Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef83d0df40cab889…

MALICIOUS

PDF

100.9 KB Created: 2021-03-20 04:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d34b9fb3ab751ac21bd17c14a5898233 SHA-1: d31ddfbd7e3ad2206033b86e1bc89d189bc5313c SHA-256: ef83d0df40cab889e0332b9fdd5895673302fd2c5e6e11b1def270d56668f4e4
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting or redirector infrastructure, indicating a link farm designed for malicious purposes. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The document body, though garbled, contains text related to a 'leveling guide', which is likely a lure to entice users to click the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=zandalari+inscription+leveling+guide In PDF document text
    • https://fazozojoxupu.weebly.com/uploads/1/3/1/1/131163788/e53bf244c.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/bittersweet_symphony_piano.pdfIn PDF document text
    • https://gejosubirimo.weebly.com/uploads/1/3/0/7/130776575/tiworogega-jusitunedaf-muwanogef.pdfIn PDF document text
    • http://fosonelotila.medianewsonline.com/battery_cell_balancing.pdfIn PDF document text
    • http://tixaman.scienceontheweb.net/susukodajojidemifamopu.pdfIn PDF document text
    • http://dokakepitizix.medianewsonline.com/sinusoidal_wave_equation.pdfIn PDF document text
    • https://pevamuwewewi.weebly.com/uploads/1/3/4/6/134636281/kirebi_pavoje_pudevabaguwim_lirod.pdfIn PDF document text
    • https://mewetoliwuluveb.weebly.com/uploads/1/3/4/7/134767879/lavutote.pdfIn PDF document text
    • http://sasawavivar.mygamesonline.org/blending_words_for_tnpsc_exam.pdfIn PDF document text
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/kukajavabole.pdfIn PDF document text
    • http://punejew.mygamesonline.org/fubopagi.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/40281788184.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/09fba7d4-ceed-4f17-8a29-fb282a21e14b/linking_verbs_worksheet_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f94369-ae30-4513-aedd-fadec907f762/dusekiwatozobubor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bac9193-436d-44e1-a082-c62a6faad334/mogesigus.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/87512946825.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/fikubobezijenum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8253133-bc73-4c1a-a6b8-aceafa57bf19/how_do_i_reset_my_kenwood_radio_security_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5167a056-c8ed-44a9-a114-915f13c8c371/gitemiduvijezex.pdfIn PDF document text
    • http://zesugipove.onlinewebshop.net/icao_annex_14_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/folitejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd612e5-f08b-49fa-a14a-5f2b22544e16/dekexedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1207ecc7-cce8-4e9d-b33a-a0111fab6749/2101606333.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14127 5140 bytes
SHA-256: 186478b82b2002700048993b1d5a12c9a28d6089abcc8d93ab2ad1d0a52a117f
font_01_sfnt_off000152b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B9 10908 bytes
SHA-256: bb7209e5ef3e3d89a3cbecca2959fe70fefaf34719b91a07d814d4f9b5c32461
font_02_sfnt_off00017819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17819 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3