Malicious PDF — malware analysis report

Static analysis result for SHA-256 428d7339cfa7155f…

MALICIOUS

PDF

81.1 KB Created: 2021-02-20 21:52:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8de44ce7c895f52a99bfe7b45ec541c6 SHA-1: d4903d9a19cb852afc0c115d3b32860e1d2d1510 SHA-256: 428d7339cfa7155f4eede99f56fdcfa2f382c6304edf9a5533c165ca6e6cc33a
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains numerous external URLs, many hosted on disposable domains, indicating a link farm or phishing lure. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wb?keyword=presto%20pressure%20canner%20weighted%20gauge PDF link annotation
    • http://mafaregasinuviv.22web.org/congruent_triangles_worksheet_grade_7.pdfIn PDF document text
    • http://tiwikif.22web.org/74018781881.pdfIn PDF document text
    • http://potoborotagivud.22web.org/funny_brain_teaser_questions_and_answers.pdfIn PDF document text
    • https://supipujijasof.weebly.com/uploads/1/3/0/7/130739476/mudigowubegevig.pdfIn PDF document text
    • http://dobewobezusisof.iblogger.org/dr_safety_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_60215835c8c30.pdfIn PDF document text
    • https://telusexuv.weebly.com/uploads/1/3/0/7/130776200/248179.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425514/normal_5fefa7cfd07a3.pdfIn PDF document text
    • https://nulesurusisozi.weebly.com/uploads/1/3/4/7/134744420/junej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_601a1c7877020.pdfIn PDF document text
    • http://bidusifekinu.66ghz.com/facade_structural_design.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5fc56c8e36364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391893/normal_60225bab0c6b2.pdfIn PDF document text
    • https://tatisosef.weebly.com/uploads/1/3/5/3/135333589/supuwadusameda_vojitebefunos_nirizisobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://riwevanopa.epizy.com/3287347161.pdfIn PDF document text
    • http://dexidije.epizy.com/nouns_adjectives_adverbs_list.pdfIn PDF document text
    • http://nabowiruxurupob.rf.gd/mozakebeperotowidadejufa.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/miller_spectrum_375_cutmate_for_sale.pdfIn PDF document text
    • http://vadawowugozopul.epizy.com/confidant_guide_ohya.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/10806265439.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
    • 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_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 5396 bytes
SHA-256: f56470b5f516cf12c4dbf6487ae08360a083f0764773932e362ec4b5638b12a2
font_01_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 10692 bytes
SHA-256: 62138216ea3bf67ecd0648fa65ee36b1d38abf4baa628fcb19d60b1f336faaca
font_02_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 16312 bytes
SHA-256: 6f30d31ab53d325f4e3f08a53e883132ea92c501d32d7b77fa495aa04f83fc5c

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