Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f47695e88b2c8e…

MALICIOUS

PDF

81.1 KB Created: 2021-03-18 04:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7ff45cd6323df9cc575ba73aadbd6c7d SHA-1: fd461adeef73df178e5cbac598f1bd0c13595791 SHA-256: 83f47695e88b2c8e3a3372a35ad5ef31abed862b2898c46583ddf78431b82272
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm or SEO spam campaign designed to redirect users to potentially malicious sites. The document body is heavily obfuscated and appears to contain junk data, further supporting a malicious purpose rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=what+does+the+water+manometer+typically+measure PDF link annotation
    • http://yesnutural.space/12138635128mbgml.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/nike_baseball_team_sponsorship.pdfIn PDF document text
    • http://probnik1313.tech/656803562443qjpi.pdfIn PDF document text
    • https://damanula.weebly.com/uploads/1/3/1/8/131856109/f83ee2148e9.pdfIn PDF document text
    • http://ellmax-site.xyz/pofiseyktiv.pdfIn PDF document text
    • http://milanomodaitaly.site/john_gba_lite_app_download3iwgc.pdfIn PDF document text
    • http://shop-profildoors.ru/colour_me_beautifulpsu0x.pdfIn PDF document text
    • http://italia-doc.space/ipega_controller_for_ioszh2rf.pdfIn PDF document text
    • https://gadigode.weebly.com/uploads/1/3/2/6/132680949/fa6f1a5a9e78c52.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/87742524699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_92682d712d794b899930a0a8189f3be2.pdf?index=trueIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_ef844904752d41668f134d2abb54d69f.pdf?index=trueIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_09e5a82139d541afab2f9c612bb4c223.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_b726a9dcbac141e0b56a17adac18a8ca.pdf?index=trueIn PDF document text
    • http://pikubub.onlinewebshop.net/how_to_cook_rice_in_the_electric_pressure_cooker.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_38ffd386d04a4b2b978573577524d67b.pdf?index=trueIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_cb43047b82dc4bb78c8a807514dd8ca7.pdf?index=trueIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_d0ee197d6a2348c6a53876bf86efd86e.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 5520 bytes
SHA-256: ab5b82952b999750ef9f8aa64e7ac77beee33136f59d386de5a0b71d96e7127e
font_01_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 12272 bytes
SHA-256: 7ebb9d228c87875fc5ab1d5542545013a90f5a386901ebcbb0dc39bf49e00189
font_02_sfnt_off00012191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 16292 bytes
SHA-256: 1ded105c2a785beb96fac8dffb1ceadd20fd9d751745c9c68a0e3318805f30ca