Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ecff4d9baf5d74…

MALICIOUS

PDF

89.7 KB Created: 2021-05-09 19:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c27950df503fba7d2e778c10fa87c823 SHA-1: 9d3ca2fbf2d1be75f3bc89d7dcd270f04378b1c0 SHA-256: 81ecff4d9baf5d742af85eb1bf4292a8542878eb658244406054d220b522f9b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with a significant portion hosted on disposable domains and employing UTM parameters, indicating a phishing or redirection scheme. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature, likely serving as a lure to phishing sites or a distribution point for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jumiwimov.ru/strik?utm_term=braun+thermoscan+hm3+manual PDF link annotation
    • http://cashfree.store/soweto_gospel_choir_songs_fakaza7451f.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/blNgjvi/28166334973.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/hIdjhWs/14262179977.pdfIn PDF document text
    • https://pezazexumazu.weebly.com/uploads/1/3/5/3/135392870/bolajutopemib-xevovipemege-sedovuge-tatadogaw.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/pbjauHH/jijajinokirixek.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/e96f7b2.pdfIn PDF document text
    • https://ruposasaje.weebly.com/uploads/1/3/4/3/134372592/vewowukejuz-xerupor.pdfIn PDF document text
    • http://fragcups.com/duwenebuzivalovonexu0ewr7.pdfIn PDF document text
    • https://bafexobis.weebly.com/uploads/1/3/4/0/134041027/satulowuk_vatidibuz_pawozu_redopage.pdfIn PDF document text
    • http://italiahot.space/rudelic8mr7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_601f2cd78a658.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/ii4ZOha/31942242606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479236/normal_605bc8bc98cb0.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://instapodarok365.site/faguzutalumow94zsi.pdfIn PDF document text
    • http://natur-bio.space/jopoliligezuqtdkn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413369/normal_602726da2e938.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/jitimesolagun/fuguvudipepefiwonitu.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/sierra_tipped_matchking_308_load_data.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/spinal_tuberculosis_radiology.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/excel_bedingte_formatierung_formeln_hervorheben.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 6416 bytes
SHA-256: 528d1e79c27aec131c2cbf846536b85f4c117e3725d0fa982f5a85159cdab222
font_01_sfnt_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 5252 bytes
SHA-256: b12c3b78bc94aa2fef258504f0aeb823fa24da642bac4abfb300c8edcb2eb8e6
font_02_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 8992 bytes
SHA-256: ddf1de2e853d40c3176e915e1e69a3aa333c6343bf75080555c339dd9eab0d69
font_03_sfnt_off0001148d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148D 10728 bytes
SHA-256: 7141add7f89901e8cb4e0be6e7ceb2e6bf9df5794b1a3d2c482d56c9877de84a
font_04_sfnt_off00013981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13981 16256 bytes
SHA-256: 8cc6bcc2cf3defe0a88aedbd81e1c3d6ddceaf294630c8a268e5b6d92b2eedfb
font_05_sfnt_off00014ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDE 1736 bytes
SHA-256: 0d9b6ab0354368cdfa5a4e52e4dfb250ede80cec4283e48fafec0a3c1c1d30df

Open this report in the interactive analyzer, or submit your own file for analysis.