Malicious PDF — malware analysis report

Static analysis result for SHA-256 656f5222ac943d64…

MALICIOUS

PDF

81.8 KB Created: 2021-03-10 03:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5096a641b2361bce222ddaf1702388b1 SHA-1: ddafb789f5cdf25ab44b23e196fc50229c55d077 SHA-256: 656f5222ac943d646e15e153b10211d550609d8b1572fd160db73386dc24902b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=proc+summary+sas+syntax+example PDF link annotation
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/velumomexavemisetupu.pdfIn PDF document text
    • http://zootime.store/manual_instrucciones_impresora_hp_deskjet_25441vuva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388406/normal_600204b664ed7.pdfIn PDF document text
    • http://pojekofa.iblogger.org/85764808802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5feaf521425ce.pdfIn PDF document text
    • http://coupons2020.info/choose_your_own_adventure_book_clubfysem.pdfIn PDF document text
    • https://moxalabukeziro.weebly.com/uploads/1/3/4/7/134772199/zisex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384633/normal_5fdf077f887cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_5fe6138d60d35.pdfIn PDF document text
    • http://grantmedica.ru/anime_face_drawing_tutorial_for_beginnersm0ppq.pdfIn PDF document text
    • http://fakaripeti.xyz/naruto_shippuden_psp_games_free_isobmv4i.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/34632684205.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/21381273534.pdfIn PDF document text
    • http://teatr-art.com/65687435810qk2c4.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/ganixa.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/felofapopesipowilub.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/tuzamada/41998301723.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/acthar_gel_start_form.pdfIn PDF document text
    • http://rudinadaxom.rf.gd/can_you_donate_a_bed_to_salvation_army.pdfIn PDF document text
    • http://lenixad.epizy.com/nonorijolawazozi.pdfIn PDF document text
    • http://tikimiwuwal.myartsonline.com/tolomofemekasama.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_off0000f6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D3 5248 bytes
SHA-256: 159b1d2cb56a6b2b59ec1a050885e1433cadc08ca960aefa6d3a3d95e03ee237
font_01_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 2092 bytes
SHA-256: 13678a14b930e6d42e11b2ac41b13981c2c7f5938cc30cfb194ad51886f1f1dd
font_02_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 11848 bytes
SHA-256: 515b3ce7c6d4c5aec9a330219d256235932a9adfb7fd6d46767148c33f8d3f07