Malicious PDF — malware analysis report

Static analysis result for SHA-256 881433a959b56467…

MALICIOUS

PDF

74.4 KB Created: 2021-04-06 07:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8de096a927f2b2f7b9f58f5154786cd SHA-1: 7ab7b56727e329ab76645e3a8449f4e03440b504 SHA-256: 881433a959b56467ead6ab45e23e0c2f74eebb81324a8ea4e4da7629c16d7e39
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely leveraging a PDF exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=performance+curve+of+centrifugal+pump.+pdf
    • http://visunuduxat.mypressonline.com/algebra_formulas_for_ssc.pdf
    • http://vegifeda.mypressonline.com/zejepodokip.pdf
    • http://gasurorir.sportsontheweb.net/tokatu.pdf
    • https://cdn-cms.f-static.net/uploads/4369150/normal_6062020429b50.pdf
    • https://cdn-cms.f-static.net/uploads/4422133/normal_600f7ed66ac52.pdf
    • http://davizaxokekibe.iblogger.org/gilajof.pdf
    • http://xufuzema.sportsontheweb.net/backcross_method.pdf
    • https://cdn-cms.f-static.net/uploads/4413976/normal_604d0b841f2e3.pdf
    • http://kojijeku.mygamesonline.org/antrenmanlarla_matematik_3_zml.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rixutizabegu.rf.gd/fudunobifunogariku.pdf
    • http://sudemididesiz.epizy.com/mijenipumimi.pdf
    • http://nejesezape.myartsonline.com/oral_b_white_pro_1000_reviews.pdf
    • http://pekowob.onlinewebshop.net/aerobic_capacity_training.pdf
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_155ba19e744141f3bb4b392a72d6dbaa.pdf?index=true
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_624bb1b1e42e416d84cec01eb66c1aa2.pdf?index=true
    • http://puwowega.epizy.com/36536006970.pdf
    • http://manosotidokef.myartsonline.com/vitutesebusunila.pdf
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_2a18b0b1b89948baac515c31246b5b85.pdf?index=true
    • http://werekixaw.epizy.com/four_types_of_sentences_worksheet_4th_grade.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e787.bin
a4d479b52c19c0f6afb6fe35bdb37048274a84209d086c6a4607edbbaf2b2e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 5388 bytes
font_01_sfnt_off0000f9d4.bin
7a4852a3aa80e36e1f64a6f78eaf474115f94dd24b66691904558d99b7730b88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 10140 bytes

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